Obverse: identify the front

The inspected NGCtype describes the national arms with the eagle facing left. Keep the complete national legend and arms face in identification photographs. Fractional Libertads and other Mexican bullion sizes can have visually related arms; this face alone does not establish metal, weight or finish.

Reverse: identify the back

NGCdescribes Winged Victory on the matching KM 542 reverse. The full 1/20 onza denomination or weight inscription, date, fineness and Mo attribution must be kept visible. A Victory motif cropped away from its legends can confuse gold, silver and different ounce fractions. A genuine matched photo pair for this dated type is still awaiting independent photographic permission and identity review.

History and purpose

The inspected KM 542 table covers the earlier 1991–1995 dated family. Later numbered families must retain their own dated standards, dimensions and design attribution. A product described as an ounce fraction need not have the same displayed ASW precision in every reference. No continuous 1991-to-current issue span is asserted from this first verified table.

How to identify this variant

Match the silver fraction 1/20 onza, the actual 1991–1995 date and Mo mintmark to KM 542. Its NGCnominal references are 1.5551 g and 16 mm with .999 fineness. No edge or thickness is independently approved from the inspected type. Photographs and dimensions are identification evidence rather than assay or authentication. Similar gold fractions are outside this silver profile.

Understanding its metal content

One matching coin contributes 0.0499 reference fine silver troy ounce; three contribute 0.1497 fine silver ounces and 4.6653 nominal gross grams. The calculator retains the reference’s stated ASW rather than replacing it with the marketed ounce fraction or a mass-derived value. Wear, assay and collector value are distinct from nominal content. Dollar melt pricing is unavailable until an approved provider supplies it.

Dates, varieties and composition changes

Specific source-supported issue years:1991–1995. The reference lists regular Mo coins for each of these five years and separate proof rows for 1992,1993,1994 and 1995. The table does not establish a 1991 proof. A proof entry describes a separately attributed manufacture; a shiny or polished coin is not automatically a proof. Retain date, fraction, mintmark and documented finish for each specimen.

Melt value versus collector value

Preserve genuine surfaces, original packaging, provenance and any reputable certification. A verified proof finish, date or other supported variety may affect collector value beyond nominal silver. Do not assign a proof or unusual variety from lighting alone. Separate original mint finish from polishing, cleaning or later surface treatment.

Authenticity and condition

Provide complete obverse, reverse and edge photographs with measured mass and diameter where available. The 1.5551 g/16 mm references do not authenticate a plated piece or guarantee .999 fineness. Keep all legends and the date visible; replicas, altered dates and unexpectedly light specimens require individual examination.

Selling this coin

Sort the matching 1/20 onza silver Libertads separately from other fractions, gold Libertads and unresolved later references. Include the exact date and supported proof attribution in the established CashForCoins photo-appraisal enquiry. The selected quantity supplies collection context and is not an automatic purchase offer.

Sources and calculation methodology

The designated reference world-silver melt table omits this fractional Libertad. Exact dated KM 542 supplies 1.5551 g/.999/0.0499 fine silver troy ounce and 16 mm. Actual annual rows support 1991–1995 regular coins and 1992–1995 proof entries; no 1991 proof is inferred. The named ounce fraction is a product identity, while this guide retains the rounded ASW stated by the matching reference dated type. Later KM 609 reports the same 1.5551 g/.999/.0499 oz/16 mm reference but a distinct dated family. Its 1996–2010 annual rows were inspected separately; later tail years and matched licensed images still require review before extending this current first dated scope. No false new purity or mass subtype is asserted solely from a rounding difference. Public reference specification, design and actual annual rows were inspected on 2026-10-12. No prices or mintages are republished. The genuine Banco de México photographs represent regular 1991 examples, with institutional source and published collection permission attributed. They do not illustrate the separately listed proof finishes or assay another specimen.

Common questions

References

• NGC Mexican Silver Libertad 1/20 onza KM542 — dated identity; weight; fineness; silver ounces; diameter; dates from annual rows; design; mint and proof entries (checked 2026-10-12)
• Banco de México exact photographed 1991 specimen, inventory17675 — identity; design; dates; measured specimen weight and diameter, distinct from retained nominal standards; source-specific paired institutional photographs (checked 2026-10-12)

Issue-year references

• NGC Mexican Silver Libertad 1/20 onza KM542

Content maintained by CashForCoins. Last substantive record update: 2026-10-12. Report a specification or attribution issue through our contact page.

Related coins

Mexican Silver Libertad Tenth-Ounce — 1991–1995

Photo credits and rights on the linked coin profile.

Mexico • 99.9% silver; remaining alloy metals not independently verified

Issue years: 1991–1995

Fine silver: 0.099900 troy oz

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