Reading the reverse: Mexican & Taxco silver marks

Read the whole group before naming the maker.

A Mexican silver mark can be small, worn, partly hidden by a clasp, or spread across several components. The temptation is to recognize one familiar shape and stop. A better beginning is slower: photograph the whole reverse, then each mark, and transcribe only what you can actually read.

Separate the claims. A fineness number concerns the alloy. A place name concerns origin. A name or monogram may identify a designer, workshop, retailer or successor. An eagle or letter-number registration belongs to a marking system. A design or inventory number may identify a model rather than an individual object.

These are research clues. Stamps can be copied, misread, worn or attached to a replaced component. No sequence of text selections in a decoder measures metal content or establishes authenticity. Use the general Silver Mark Decoder to understand marking language, then investigate the exact impression and object.

• Open the Silver Mark Decoder
• Explore the people and objects behind the marks

Why 940, 970 and 980 appear beside 925.

When used as fineness marks, these numbers describe parts of silver per thousand parts of alloy. A mark of 925 claims 92.5% silver; 940 claims 94%; 970 claims 97%; 980 claims 98%. The interpretation is straightforward, but the stamp remains a claim about the marked component, not an independent assay of the entire object.

Documented examples make the distinction useful. The Brooklyn Museum records 980 on a short reverse link of a Spratling bracelet dated about 1935–1940. Bonhams records 970 on the necklace in its Antonio Pineda lot 2055, while the accompanying bracelet is described as STERLING. In Aguilar lot 2134, the bracelets are catalogued with 940 marks and the necklace with STERLING.

Do not turn these examples into exclusive maker codes. A 980 stamp does not identify Spratling, and a 970 stamp does not identify Pineda. Nor does fineness alone predict color, hardness, tarnish behavior or value: the alloy, working history, surface and condition also matter.

Not every number is a fineness number. Read the surrounding words and compare the complete group with a documented reference before interpreting an isolated three- or four-digit stamp.

Three broad periods, with blurred edges.

Specialist collector references place the introduction of numbered eagle marks around 1948 and the transition to letter-number registrations around 1979–1980. These are useful broad research periods, not exact manufacturing-date cutoffs for every jewel.

Earlier pieces may carry a maker’s name or monogram, place and fineness without an eagle. A missing eagle does not prove that an object predates 1948. Marks can be absent, worn, obscured or located somewhere you have not photographed.

An eagle containing a number can help you compare a piece with a documented workshop and period. Its outline, number, neighboring marks and location all matter. Avoid treating an online number-to-name list as a universal key. A workshop’s mark combinations can change over time, and a copied punch cannot authenticate the object carrying it.

A date assigned to a design and a later-looking mark can raise a useful question about manufacture, later marking, replacement parts or cataloging. It does not justify inventing a story that an earlier piece was counter-stamped for export. That explanation needs object-specific evidence.

Letter-number registrations: a route into research.

The later system commonly uses two letters followed by a number. Collector references explain the first letter as a place indicator, such as T for Taxco or M for Mexico City, with the following letter and number helping identify the registrant. The digits are not a manufacture year.

Do not identify a person from one initial alone. Research the complete registration and compare it with reliable records. Similar-looking codes may belong to different businesses, and the word Taxco is not a guarantee of a particular designer or level of craftsmanship.

TS-24 is a useful specific example. Specialist Spratling hallmark research associates it with Sucesores de William Spratling production from the later registration period, beginning around 1979. That supports a line of inquiry into successor-workshop production rather than a lifetime attribution. It does not prove that every object carrying those characters is genuine.

For any later piece based on an older design, ask separately when the design originated and when this particular object was manufactured. A well-made successor piece can be worthwhile on its own terms, provided the description makes the distinction clear.

• Read about lifetime and later Spratling production

Design numbers are another clue, not a certificate.

Workshop codes can help connect an object to a documented design or inventory system. Bonhams transcribes YY424 on the Pineda amethyst necklace in lot 2029 and YY578 on the necklace in lot 2055. These transcriptions are evidence about those catalogued objects; they are not a complete decoding chart for every Pineda mark.

Margot de Taxco pieces are often discussed through design numbers in collector literature. Compare a number with an illustrated, identified reference before using it to make an attribution. A worn digit, a mistaken transcription or a variant can all complicate the match. A matching number alone cannot establish manufacture date or authenticity.

Keep museum facts separate from additional collector claims. LACMA’s snake-set record describes a necklace of 26 parts and dates the set to about 1955. It does not supply the design number sometimes attached to the model in the market. Use the museum record for what it actually establishes, and cite a separate checked source for any further code identification.

Build an attribution that someone else can follow.

A useful attribution is a short chain of evidence, not a confident label. Start with the observable object, add comparisons, and keep unanswered questions visible.

• Photograph the complete object and each mark in clear, raking light. Record the position of the stamp and the component carrying it.
• Transcribe uncertain characters with a question mark rather than silently completing a familiar name or code.
• Compare the design, dimensions, materials, construction and mark group with documented examples. Record the exact museum accession number, book page or auction lot.
• Distinguish observations from the seller’s claims and from your own interpretation. A receipt preserves a transaction but does not automatically validate the attribution written on it.
• Ask about replaced clasps, resized cuffs, missing links, repairs and later production. A mark on a clasp may tell a different story from the body of the jewel.
• If the maker or period accounts for a substantial part of the price, obtain an independent specialist’s assessment and clarify the seller’s return terms.

Avoid home scratch, acid, heat or enamel-probing tests. Magnet response, tarnish and appearance may suggest further questions but cannot establish solid silver, a workshop or a date. If material testing is needed, discuss the method and its limits with an experienced professional.

A careful description can remain honest while research continues: “silver-colored bracelet, stamped TAXCO and 940, maker not established” conveys more useful information than an unsupported famous name. The goal is to preserve the object’s evidence, not to force every piece into a named workshop.

• Keep an object record
• Inspect construction without damaging the piece