Mexican Silver Hallmarks: How to Read Taxco Marks, Eagles and Numbers

A hallmark on a piece of Taxco silver is a small stamped record, often made up of several punches. The markings may name a maker or workshop, declare a silver fineness, identify a place of manufacture or indicate a registration. These are historical clues, not independent proof: a fineness stamp reports what its issuer claimed, and an eagle or registry code does not authenticate a piece on its own. Reading the complete combination helps assess a probable date and attribution.

This guide walks each component, then works through a William Spratling mark line by line. The historical explanations primarily draw on Penny Chittim Morrill and Carole A. Berk’s Mexican Silver (Schiffer, revised edition) and Gobi Stromberg’s Silver Seduction: The Art of Mexican Modernist Antonio Pineda (Fowler Museum, 2008). Page numbers below refer to those editions; where a mark attribution depends on a particular specimen, inspect the actual punch as well.

What does a Taxco silver hallmark contain?

Before about 1948, a Taxco maker might use a name or initials with a place mark and stated fineness. Around 1948 the Mexican government introduced numbered eagle registration stamps within a system intended to regulate silver output and provide assurance to buyers. That historical purpose does not turn an eagle impression into a modern authentication or assay certificate. Kim Richter, writing in Stromberg's Pineda monograph, walks through the five components of a typical Pineda hallmark (p. 81):

1. Place of manufacture, usually "TAXCO," "HECHO EN MEXICO," or "MADE IN MEXICO"
2. Silver quality, a three-digit number reflecting parts of pure silver per thousand (925 = sterling; 970 was Pineda's most common; 980 also appears)
3. Eagle registration mark, the government stamp plus the workshop's assigned eagle number (Pineda's was Eagle 17)
4. The maker's personal mark, for Pineda after 1953, "Antonio" in an arched crown cartouche
5. An inventory or design number, Pineda used letter pairs to encode form factor: 99 rings, 89 brooches, 82 buckles, 77 necklaces, 22 bracelets (Stromberg/Richter, p. 81), appended to a digit sequence

Not every workshop used all five. Small shops often skipped the inventory number entirely. What the components have in common is that each one is a separate punch, a hallmark is a composition of marks, not a single stamp.

What do 925, 940, 970, and 980 mean on Mexican silver?

The three-digit number is a purity claim: parts of pure silver per thousand parts of alloy. Several values turn up repeatedly in Golden Age Taxco:

• 925, sterling. The U.S. standard, 925 parts silver per thousand (Stromberg/Richter, p. 79). Most post-1945 Taxco work ran at 925. Morrill's figure captions show TAXCO 925 and STERLING stamps across Spratling's post-1944 output (e.g., Morrill p. 72).
• 940, a claim of 94% silver. This fineness appears among documented early-to-midcentury Mexican purity stamps (see the 925-1000 Mexican silver marks reference below); it is not a maker-specific identification.
• 970, Antonio Pineda's house standard. Richter: "The quality of the silver content in Pineda's work was usually indicated by the number 970, meaning that it was 97% pure silver" (Stromberg, p. 79).
• 980, "Spratling Silver." In the Montgomery Ward Christmas 1943 catalogue, Spratling Silver was described as "a silver purer and finer than sterling with less tendency to oxidize and discolor the skin and with a softer luster when finished. Spratling Silver is 980/1000 pure silver while sterling, according to U.S. government standards, is only 925/1000 pure silver" (quoted in Morrill, p. 45). A TAXCO 980 stamp shows up across multiple unrelated makers in Morrill (Rafael Dominguez p. 152; Valentín Vidaurreta p. 115; Serafín Moctezuma p. 38), suggesting 980 was a common Golden Age mark for pre-sterling-era Taxco output, not exclusive to Spratling.
• Other values, Morrill's own reference gallery documents an unattributed "Taxco 960 brooch in silver and onyx, c.1945" (plate XXVII-4, p. 244), and oddities like "ESTEREO MADE IN MEXICO 580" (Los Castillo, p. 87) and "METALES CASTILLO 883" (Los Castillo, p. 92) turn up where the number appears to reference a mixed-metal line (Los Castillo's Metales Casados) rather than a silver-purity claim.

No stamped number, including 925, 970 or 980, proves the alloy’s composition. A reliable assessment may require examination of the complete mark combination, provenance and independent metal testing.

What is the eagle mark on Mexican silver?

Starting in 1948, the Mexican federal government required every registered silver workshop to apply an eagle stamp along with a numerical code identifying the workshop. Per Richter (Stromberg, p. 81):

Eagle marks were simple to obtain from the government, and shops used many different eagle marks at various times. Major silver workshops received a number that was imprinted with their specific eagle mark, while small shops were not given individual numbers and instead used the "Eagle #3."

The eagle was used as part of a tax and registration regime intended to assure buyers of proper silver standards. Today it should be treated as a period and registration clue, not as independent proof that a particular object is genuine or has the stamped fineness.

The one eagle-to-workshop assignment that both canonical texts confirm is Eagle 17 for Antonio Pineda, called out by Richter as Pineda's "most common" number and dated 1948-1979 (Stromberg, p. 81). Richter also documents the generic Eagle 3, used by small shops that were not given their own registration (Stromberg, p. 81). Other workshop-to-eagle assignments circulate in collector references, our hallmarks corpus catalogs the post-1948 Eagle marks tied to each Golden Age workshop, but they are not enumerated together in either Morrill or Stromberg, so cross-check any specific attribution against the actual mark rather than a claimed assignment.

The system was short-lived. Richter records that the eagle mark was "officially abandoned by 1979-1980," at which point the Mexican government introduced the letter-number registration system that is still in use today (Stromberg, p. 81).

What do post-1980 letter-number marks like TS24 mean?

The post-1980 system assigns each silver manufacturer a two-letter prefix plus two or three digits. Richter gives the exact anatomy: "TS24, where the 'T' stands for Taxco and 'S24' for Spratling" (Stromberg, p. 81). Other T-prefix codes follow the same logic.

This matters for collectors in two directions.

First, TS24 is an identified registration associated with post-1980 Spratling successor production (Sucesores de William Spratling; see Morrill, pp. 246-247). The code by itself neither proves that a particular impression is authentic nor establishes that William Spratling personally made the object. Nor is it, simply by being a later code, evidence of a counterfeit. Read it together with the other punches and the object’s provenance.

Second, the letter-number system strips the visual identity the pre-1980 hallmark carried. Morrill puts the point sharply:

The advent of the new system in c. 1980 of identifying silversmiths with numbers and letters is an unfortunate one. Without the signature of the maker, the new marks further remove the artisan from the buyer, increasing the level of anonymity (Morrill, p. 244).

In practice, pre-1980 pieces are what most collectors mean when they say "Golden Age Taxco", the era when a maker's initials were the primary identifier, and the government stamps were supporting evidence.

How do you read a William Spratling hallmark?

The image at the top of this guide shows a Spratling-associated oval SPRATLING SILVER stamp alongside a circular monogram cartouche, attributed to about 1940–1944. The museum’s existing image metadata transcribes the circle as WM SPRATLING MADE IN MEXICO; this reading should be checked against the original photograph before being treated as definitive. Morrill describes a related mark combination with different wording (revised edition, p. 45):

The mark which is consistently found on pieces that appeared in the catalogues is the "WS" surrounded by a narrow band on which is inscribed, "Spratling Taxco Mexico." This mark is coupled with an oval indentation in which the words, "Spratling Silver" appear. The latter oval mark indicated the silver content as 980.

Decomposed, the mark tells you:

• Maker-associated emblem, the interlaced WS monogram in the centre of the circular punch, associated with Spratling’s workshop. A workshop mark does not establish that the named designer personally fabricated the object.
• Circle inscription, provisionally catalogued in our image metadata as WM SPRATLING MADE IN MEXICO. The quoted Morrill example instead reads SPRATLING TAXCO MEXICO. These are different transcriptions and should not be presented as one verified die.
• Declared fineness, the SPRATLING SILVER oval above. The historical Spratling Silver brand was advertised as 980/1000 silver; that claim is not independent confirmation of the alloy on this specimen.
• No eagle visible in this example, consistent with an attribution to the earlier 1940s. Absence of an eagle alone is not a conclusive date.

For the full chronology of Spratling marks, from the 1931 print-brand monogram through the late-period script marks, see the William Spratling profile.

How do you spot fake or misread Taxco hallmarks?

Worn stamps get transcribed wrong. A 5 can pass for a 3, a 9 for a 6. Auction cataloguers read hallmarks in good faith and sometimes miss. If a design attribution depends on a single digit of a stamp, cross-check against a cataloged example before trusting it. The Margot 5194 and 5537 anomalies documented in the Margot design-numbers guide are likely this kind of misread.

A "TAXCO" stamp alone is not an attribution. Morrill's own Ch. XXVII reference gallery (pp. 244-247) includes pieces cataloged as unattributed Taxco silver, the place stamp was used by workshops whose maker marks have been lost or were never applied. An unattributed Taxco stamp claims a place of origin; it does not identify a particular maker or independently prove that origin.

Known counterfeits exist and are cataloged. Pre-1980 Aguilar pieces, for example, have a widely-documented "fake tail" variant in circulation: a hand that copies the HA monogram but renders the descending stroke of the "A" incorrectly. Our hallmarks reference flags these and other known-counterfeit examples alongside the legitimate chronologies.

Post-1980 letter-number codes are not inherently suspicious. TS24 is associated with Spratling successor-workshop registrations (Stromberg, p. 81). The initial T commonly indicates Taxco; a code indicates a later registration system, not proof of when the object was first fabricated or that a given impression is genuine.

A missing eagle on an object attributed to about 1948–1980 calls for context. Check the other marks, possible later alterations and the proposed maker chronology. A missing eagle may be a reason to investigate, but cannot by itself establish a forgery.

Where can you look up a specific Taxco hallmark?

• Browse the hallmark reference, documented maker and workshop records, registry codes, eagle numbers and flagged suspected counterfeit examples. Published coverage is broader than the eight best-known Golden Age workshops and is not exhaustive.
• Reading Margot de Taxco's design numbers, the companion guide on how Margot's 5xxx stamps work (design number, not item number).
• Individual artist profiles provide further chronology and specimen comparisons, including Spratling and Antonio Pineda. Record totals and associations may change as new examples are reviewed.