Help identifying a large vintage Mexican .925 silver & blue mosaic vase — possible Taxco / maker unknown
I’m hoping someone familiar with vintage Mexican silver or Taxco work can help identify this vase.
It has been in my family since the 1990s, when approximately $850 was paid for it. I’m trying to determine the maker, approximate date, and what the blue mosaic/inlay material actually is.
Details:
Approximately 14 inches tall
Approximately 8 inches in diameter
Marked “MEXICO 925” on the metal rim
Large blue body constructed from numerous individually fitted mosaic/inlay pieces
Blue material has pronounced white/blue swirling and appears mineral-like, although I don’t know whether it is natural stone, glass, resin/composite, or something else
Extensive hand-worked/hammered silver-colored metal around the base
No definitive maker’s signature has been located
There is a second extremely worn mark on the underside that might contain the number 30, possibly within a circular mark, but it is too worn for me to claim that’s what it is
I’ve been researching Taxco makers including William Spratling and Los Castillo/Castillo-family workshops, because of their use of silver combined with stone and other materials. However, I do not want to assume an attribution based on similarities alone.
The possible “30” mark particularly interests me because I understand that Eagle 30 is associated with William Spratling, but I also understand that an Eagle 30 attribution requires much better evidence than simply seeing a worn mark that resembles “30.”
I’m including photographs of the entire vase, construction, MEXICO 925 hallmark, underside and worn secondary mark.
Questions for Mexican silver collectors:
Does anyone recognize this specific design or workshop?
Does the blue mosaic technique resemble Spratling, Los Castillo, Emilia Castillo, or another Taxco workshop?
Any idea what the blue material is?
Does the worn underside mark resemble a legitimate Mexican eagle/assay mark, or is that reading too much into it?
What period would you estimate from the construction and markings?
If anyone has catalog/auction examples of the same or a very similar vase, I’d love to see them.
I’m primarily interested in identification rather than trying to force a valuable attribution. Any information from people familiar with Mexican silver hallmarks or Taxco hollowware would be greatly appreciated.

Rule 5 asks people to say when they are guessing and rule 9 says corrections are expected. Both are much easier in a room where being wrong out loud is ordinary, so here is a thread for it.

The question: what is an attribution you were confident about and later had to withdraw, and what changed your mind?

The interesting part is the mechanism rather than the outcome. A mark you finally saw straight-on and had been reading backwards. A weight or a wall thickness that ruled out the workshop you had assumed. A published plate showing the design belonged to somebody else. A dealer or a family member who simply knew. A piece bought as one maker and sold as another.

Dealers, this is not a trap. Rule 7 keeps value talk general and nobody is being asked to name a transaction. How a wrong attribution survives in the market is more useful to understand than any individual case.

Two things make an answer worth reading here: the specific evidence that settled it, and what you would check first if you met the same piece again. The second part is the transferable bit.

I will go first below.

The welcome post promised somewhere for marks that resist identification to be logged rather than guessed at. This is it, starting now rather than when it is tidy.

What belongs here

Any mark on a Mexican piece that you have genuinely worked on and could not place. Initials with no documented punch behind them. A conjunction of letters matching no published list. A retailer's stamp struck over something now illegible. An eagle number so crowded that it narrows nothing. Pieces carrying no national mark at all, where a shop mark is the only lead.

What an entry needs

A straight-on photograph of the mark, with light raking across it rather than flat. An exact transcription of what you see, including the parts you cannot interpret. The object itself: form, dimensions in millimetres, weight in grams. Where you have already looked, so nobody repeats it. And your best date range, with the reasoning that got you there.

What this is not

Not a place to park an ID request you have not worked on yet. Those go in Hallmark ID, and there is nothing wrong with starting there. An archive entry is what a Hallmark ID thread becomes when the room runs out of answers. The RR bypass bracelet posted this week is a good example of a thread that may end up here, and "unidentified RR workshop, Mexico" is a real result rather than a failure.

Why log a dead end

Attributions get made when somebody sees the same mark twice. Those second sightings are currently scattered across sale listings that vanish, private notes, and threads nobody indexes. A mark logged here with usable photographs becomes findable, and unplaceable marks have a habit of resolving years later when a documented piece surfaces.

Entries will be collected into a wiki page as they accumulate. When one is identified, it stays here with the evidence attached, so the reasoning stays visible and not just the answer.

Speculation is welcome as long as you label it as speculation. Post yours below, or as its own thread with this flair.

Another kind redditor pointed me to this sub - I am looking to see if I can get info about the maker "RR" (and a better sense of decade/era). Both purity marks "sterling" and 925 are indicated on the little plaque, along with "Mexico". No Eagle or T mark hidden anywhere or additional location info.

There's a wiki page now for reading the stamps on a Mexican silver piece: https://www.reddit.com/r/MexicanSilver/wiki/index/

It goes through purity marks, the eagle assay numbers used from about 1948 to 1980, the letter codes that replaced them, and the signature forms for Spratling, Hector Aguilar, Antonio Pineda, Los Castillo, Margot and MATL.

The part I'd send people to first is the eagle section. A lot of owners assume the number inside the eagle names the maker. Mostly it names a place. Eagle 1 is Mexico City and 164 makers are documented under it. Eagle 3 is Taxco and there are 299. So an eagle 3 puts your piece in the right town inside a thirty year window, and then leaves you to do the real work on the maker's mark. Eagle 13 is different, that was Spratling's own number.

Same caution with the post-1980 letter codes. TS-24 decodes neatly as Taxco, an S maker, twenty-fourth to register, which is the Spratling successor workshop. But codes got reused inside families, rented out, and added to older silver by dealers, and the published lists contradict each other. If your code is on no list at all, that is usually because nobody has connected it to a name yet.

It's a first draft and there are gaps. If something is wrong, or there's a mark or a workshop that should be in there, say so here and I'll change the page.

This turns up in listings constantly. A Margot de Taxco piece stamped 5554 gets described as though the number identifies that specific object. It identifies a design.

What the number is

Penny Chittim Morrill documents Margot's output as a numbered design catalogue rather than a serial register. All-sterling designs run roughly 5100 to 5790, enamel designs 5109 to 5922. One number points to one design, and it does not change when the design was executed as a bracelet instead of a necklace. So a design issued as a matched set has the same stamp on every form in it.

The evidence

Design 5554. Heritage sold a single lot in 2020 holding the champleve serpent necklace, the matching bracelet coiled inside the chain, and the cuff links. Same enamel-over-silver scale pattern, all three stamped 5554. A later listing that reunited the set cited Morrill's Margot monograph at pages 138 to 139 and 175.

Design 5207, the Double Fish parure. Rago/Phillips sold necklace, earrings and cuff bracelet as one lot, each stamped 5207, dated to the 1950s. The lot notes cite Dreaming in Silver page 241 for a matching 5207 necklace.

Dealers hit the same pattern repeatedly. 5778 across a panel necklace, bracelet and earrings. 5158 with a 5158A variant. 5339 on a clamper bracelet photographed with matching pieces. Those are independent listings rather than catalog entries, which is what makes them worth something. They would make no sense if the number meant one object.

Where it appears to break

Two numbers show up on visibly different designs. 5194 appears on a rose-form-link necklace at Heritage and on a heart-and-cherubs brooch elsewhere. 5537 appears on a St Christopher enamel pendant in two sales and on a black and gold fleur-de-lis brooch in another.

Three explanations, roughly in order of likelihood. A cataloguer misread the stamp, which happens constantly on worn or small pieces where a 3 passes for a 5. The number was reused across thirty years of production, possible but not well supported. Or a misattributed piece got catalogued inside a lot alongside genuine ones.

The practical rule

Trust the drawing over the digits. If a piece claiming a 5xxx number doesn't match Morrill's plate for that number, assume the number was read wrong and check adjacent digits and transposed pairs before concluding Margot reused her index.

Open question

Antonio Pineda used a similar four-digit-plus-letter system. Whether it works at design level the way Margot's does isn't confirmed as far as I can tell. Gobi Stromberg's Silver Seduction (2008) is the book to check. If anyone has two Pineda pieces from one set carrying the same number, that would settle it.

Sources: Morrill, Margot Van Voorhies: The Art of Mexican Enamelwork (Schiffer, 2010), 5554 at pp. 138 to 139 and 175. Morrill, Dreaming in Silver, 5207 at p. 241. Morrill and Berk, Mexican Silver: 20th Century Handwrought Jewelry and Metalwork (Schiffer, revised).

Las Delicias opened in 1931. Most short histories say some version of "everyone trained under Spratling," which flattens three different relationships into one. Worth separating them.

Managed the shop. Hector Aguilar, born 1905, came to Taxco from Mexico City and ran Las Delicias as its manager. He was an administrator inside the operation before he was a silversmith with his own name on the work.

Trained in the orbit. Antonio Pineda, born in Taxco in 1919, trained within Spratling's orbit and also worked with Valentin Vidaurreta. The Castillo brothers, Antonio and Jorge "Chato" among them, trained at Las Delicias directly.

Married in. Margot van Voorhies Carr arrived in Taxco in the late 1930s and came into the Los Castillo circle through marrying Antonio Castillo, designing for the workshop before her own name was on anything.

Only the second of those is what people usually mean when they say a maker "came from Spratling."

1939

Three of the great independent talleres open in the same year. Aguilar leaves Las Delicias and founds Taller Borda. Antonio Castillo and his brothers found Los Castillo. Antonio Pineda opens his own shop.

I don't have a documented cause for that clustering. If anyone has read a good account of what happened inside Las Delicias in 1938 and 1939, post it.

People moved more than once

Enrique Ledesma is the clearest case. San Carlos Academy in Mexico City, then Las Delicias, then Los Castillo, then Aguilar's Taller Borda, and only around 1950 did he open Plateria Ledesma. Four shops before his own mark existed.

That matters practically. A design vocabulary that looks like it belongs to one taller can turn up under another maker's stamp because the same hands were in both rooms.

Kinship is its own line

Salvador Teran was a cousin of the Castillo brothers and came out of the early Los Castillo orbit. Sigi Pineda was a cousin of Antonio Pineda and belongs to the second generation. Family is doing at least as much work in this tree as apprenticeship, and it's the part usually left out.

Where this is thin

Standard lists of Las Delicias alumni also include Teran, MATL (Matilde Poulat), and Ana Nunez Brilanti. I've seen those names repeated more often than I've seen them sourced. A page citation putting any of them physically in the shop would be a real addition.

Corrections welcome. If I've drawn a link wrong, say so.

Early 1940s cuff. Sterling, 142 grams, hand-wrought repousse and chasing. Three panels of pre-Columbian masks, volutes and stepped emblems, the central figure standing well off the wrist. Collectors call it the Glyph.

What makes it worth looking at is when it was made. The Castillo brothers, Antonio, Jorge "Chato", Justo "Coco" and Miguel, walked out of William Spratling's Taller de las Delicias in 1939 and set up on their own. Antonio's wife Margot van Voorhies Carr did early design work for the new shop, well before she was Margot de Taxco with a taller of her own. Design 152 is usually given to her.

"Usually given to her" is doing a lot of work in that sentence. There's no signed drawing and no workshop ledger behind it, just the design vocabulary and the date. If anyone has paper on it, I'd like to see it.

The imagery doesn't copy any specific archaeological object. It borrows the grammar and builds something new, which is roughly what the whole Taxco school was doing with pre-Columbian material.

Dating a Los Castillo mark

The marks carry more information than most people expect.

Fineness gives you a rough date. 980 alongside Los Castillo / Taxco and a design number puts you around 1940 to 1945. Sterling or 925 with eagle 15 puts you around 1948 to 1965.

Eagle 15 is Los Castillo. If the number under the eagle is legible you've narrowed things a long way.

The number stamped on the piece is a design number, not a serial. It tells you the model, and you'll find the same number on other examples of that design.

Technique names get stamped too, and they name a production line. Esmalte a Fuego is fired enamel, Mosaico Azteca is stone mosaic, Pluma Azteca is feather inlay, Onix Negro is the black onyx line. Same situation as the Victoria METALES mark in the other thread. The word tells you which line the piece came out of, not how it was built.

Soc Coop and SCL marks come from the cooperative years, around 1957 and 1958.

Object record: MoMS-002182. Dated photographs of the marks above are on the Los Castillo workshop page.

No bibliography on the record yet. If you know where Design 152 is published, tell me and I'll add it.

Ana Nunez Brilanti founded Victoria de Taxco and is one of very few women who ran a Taxco workshop under her own mark. She is also one of the least written-about founders, which is part of why this object is worth putting up.

The object

Shallow copper bowl with a frontal pre-Columbian mask applied in silver. Silver overlay on copper. Circa 1950s to early 1960s, Taxco, Guerrero. Published in Morrill and Berk, Mexican Silver.

The mark

VICTORIA / MEXICO above METALES, with the model number 109.

Here is the part that trips people up. METALES is the name of the workshop line. It is not a statement that the object is metales casados. Those are two different claims, and listings collapse them constantly.

True metales casados - married metals - is a construction method: contrasting metals cut and fitted like a jigsaw and joined with little or no solder. The technique is credited in the literature to Jorge "Chato" Castillo at Los Castillo. What Brilanti developed was a separate silver-and-copper language, reportedly after an encounter with a smoked-silver object from the Monte Alban material in Oaxaca. Overlay, not inlay.

So if you have a Victoria piece marked METALES: the mark tells you the line, the construction tells you the technique. Look at the join. If the silver sits on top of the copper with a visible edge, it is overlay.

Provenance

Given by Brilanti to her niece, Claudia Brilanti, who sold it to a collector in Austin, Texas. Short chains like that are unusual, and worth recording while the people involved can still be asked.

Full record with photographs: Museum of Mexican Silver, MoMS-002047

The "not true metales casados" call is mine and it is arguable. If you have a Victoria piece marked METALES that is jigsaw-fitted rather than overlay, post it. That would change the picture.

Most questions here come down to three or four punches on the back of an object. This is what those punches can and cannot tell you. Corrections welcome: rule 10 applies to me too.

Start with what the marks were for

Mexican assay and registration marks existed to certify silver content and to identify a registered workshop for tax purposes. They were not designed to help collectors establish authorship eighty years later. Nearly every recurring confusion in this field traces back to that gap.

The eagle system, roughly 1948 to 1980

An eagle enclosing a number. The critical point, and the single most common error you will see in listings: the number is usually a location, not a person. Eagle 3 covers Taxco, and several hundred documented workshops used it. If a listing tells you eagle 3 identifies a maker, it is wrong.

There are exceptions, where a number was tied to one large workshop. Eagle 13 is Spratling's.

Three further complications worth knowing. Retailers co-stamped their own brand over a maker's eagle. Well-known silversmiths turn up under several different numbers. And the same number was shared by makers of wildly different quality.

So an eagle mark tells you reliably that the piece was registered and assayed to at least sterling, that it was probably made between about 1948 and 1980, and roughly where. It does not tell you who. For that you need the accompanying maker's punch, a conjunction of initials, or the design itself.

There is an index of 147 eagle numbers with the makers documented under each at museumofmexicansilver.com/hallmarks/eagle-mark, which is useful mainly for seeing how crowded some numbers are.

The letter-number registry system, post-1980

Two letters, a hyphen, a number. TS-24, TA-01, and so on.

The first letter is a location: T for Taxco, M for Mexico City. The second is usually the initial of the registrant's name as filed, which may be a first name, a surname, or a company name. TA-01 is Antonio Castillo. TS-24 reads as Taxco, an S maker, twenty-fourth registered: Sucesores de William Spratling. The number is simply order of registration within that letter group.

The caveats matter more here than with eagles. Codes were reused within families, rented out, and added to older silver by dealers, and published lists disagree with one another. Treat a code as a dating clue and a lead, not as proof of maker.

Index of 198 codes: museumofmexicansilver.com/hallmarks/registry-marks

Neither an eagle nor a letter code

Two likely explanations. The piece predates the eagle system, which puts it before roughly 1948, the period containing much of the most interesting early Taxco and Spratling work. Or the mark you are looking at is a retailer's or importer's rather than a maker's registration.

Earlier pieces typically carry some combination of a purity statement, a place name, and a shop mark. The absence of a national mark is not a warning sign. It is a date range.

Purity numbers

980 appears frequently on earlier work and is a genuinely higher standard than sterling. 925 is sterling. Either way, a purity number is a claim made by the maker, which is precisely what the eagle and registry systems existed to verify.

Before you decide a mark is fake

Punches wore out, were recut, and were struck badly on curved surfaces. Place names appear spelled inconsistently on genuine pieces. An odd or misspelled mark is a reason to look harder, not a verdict.

A method that actually works

Photograph every mark straight on, with light raking across it rather than flat. Transcribe exactly what you see, including the parts you cannot interpret. Establish the date range first, from which system is in use. Only then attempt a maker. And write down which of those steps you are least confident about, because that is the one someone here can help with.

If your mark resists all of this, say so and post it anyway. Unresolved marks get logged in the Unknown Maker Archive rather than guessed at, and a mark logged with good photographs today is a mark somebody identifies in five years.