Mexico • 100 pesos

Mexican .720 Silver One Hundred Pesos — Morelos

A matching Mexican .720 silver one hundred pesos depicting Morelos contains 0.6428 reference fine silver troy ounce. Actual issue years are 1977–1979. The representative photograph is a 1978 coin. Confirm the full denomination, date, design, nominal 27.77 g weight and 39 mm diameter before counting a specimen; appearance alone cannot establish authenticity.

1978 Mexican .720 Silver One Hundred Pesos — Morelos obverse: Mexican national arms
Obverse — Genuine 1978 representative; type-specific dates, designs, alloys and finishes still require attribution.
Numismatica Quetzalcoatl / Numista / CC BY 4.0; Full observed source face retained; WebP conversion only; no enlargement, retouching or synthetic reconstruction · Image source · CC BY 4.0
1978 Mexican .720 Silver One Hundred Pesos — Morelos reverse: Morelos portrait, CIEN PESOS and 1978
Reverse — Genuine 1978 representative; type-specific dates, designs, alloys and finishes still require attribution.
Numismatica Quetzalcoatl / Numista / CC BY 4.0; Full observed source face retained; WebP conversion only; no enlargement, retouching or synthetic reconstruction · Image source · CC BY 4.0

When a fresh spot bid is available, melt values use fine-metal content × spot bid. CashForCoins guide buying offers use the separately configured percentage for each metal. Selected rare/numismatic coins require an appraisal. Dollar amounts remain unavailable when a fresh quote or buying percentage is missing.

Verified coin specifications

Country
Mexico
Face denomination
100 pesos
Composition
72% silver; remaining alloy metals not independently verified
Gross weight (grams)
27.77
Fineness
0.72
Fine-metal weight (troy oz)
0.6428
Diameter (mm)
39
Edge
Reeded
Mint
Mint marked Mo (the reference dated reference)
Mint mark
Mo
Restrikes
Patterns, regional issues, tokens, counterfeits and later replicas excluded
Issue years
1977–1979

Exact reviewed annual issue dates for this assigned metal/weight scope. Mint, design, overdate and finish combinations remain type-specific; broader headings do not fill absent annual rows. Source precision exceptions and separate alloy standards are explained in the guide.

Source precision
The designated reference World Silver melt reference supplies 27.77 g gross mass, 0.72 silver fineness and 0.6428 reference fine silver troy ounce. Matching dated KM 483.1 and 483.2 records supply actual annual rows, 39 mm diameter, designs and mint notes. Thickness and the identities of remaining alloy metals are not independently verified. The licensed image page rounds gross weight to 27.78 g; the calculation preserves 27.77 g from the designated reference melt table and both dated reference types. The 20 g reverse legend describes fine metal rather than total alloy mass.

Calculate this coin’s metal content

One coin contains 0.6428 troy oz of fine silver.

Formula: specified fine-metal troy ounces × quantity. Dollar melt value additionally requires an approved current metal price.

Obverse: identify the front

The national-arms side shows an eagle facing left and ESTADOS UNIDOS MEXICANOS. Pair this face with the complete Morelos portrait and hundred-peso reverse; similar arms on later denominations do not supply a silver assay.

Reverse: identify the back

The Morelos portrait faces forward. The representative source records CIEN PESOS, 1978 andPLATA PURA 20 Gr. LEY .720. The 20 Gr.fine-silver legend must not be confused with the 27.77 g nominal gross mass used by the designated melt reference.

History and purpose

Two the reference dated types share this nominal .720 silver standard. KM 483.1 covers 1977 with a sloping right shoulder and round left shoulder without clothing folds. KM 483.2 covers 1977–1979 with a higher right shoulder and folds at the left shoulder. Design attribution and finish matter separately from metal.

How to identify this variant

Identify both faces and read the complete 100 pesos denomination and date. The included standard has 27.77 g nominal gross mass, 0.72 silver fineness and 39 mm diameter. Later base-metal 100 pesos, copper patterns, uniface patterns and replicas are excluded. Wear may reduce measured mass; a magnet, bright surface or photograph alone cannot determine precise alloy. Keep an uncertain specimen separate until its type is verified.

Understanding its metal content

The calculator uses the reference’s designated 0.6428 fine silver troy ounce for each matching coin. Three coins contribute 83.31 nominal gross grams and 1.9284 reference fine silver troy ounces. Gross grams include alloy and must not be treated as pure silver grams. Troy and avoirdupois ounces are different units. Dollar melt pricing is unavailable until an approved provider supplies a current market quote; no missing quote is shown as zero.

Dates, varieties and composition changes

Specific annual years are 1977, 1978, 1979. KM 483.1 is 1977 Mo with high/low 7 numerals, sloping right shoulder and round left shoulder without clothing folds; KM 483.2 is 1977 Mo (date in line), 1978 Mo, 1979 Mo and a separate 1979 Mo proof row, with higher right shoulder and clothing folds at the left shoulder. The 1977 designs overlap; finish and attribution require independent identification.

Melt value versus collector value

Preserve each specimen’s actual date, design attribution, finish, original surfaces and provenance. A date, die variety or condition may affect collector interest independently of silver content. The calculated metal amount does not establish rarity, grade or an offer. Avoid cleaning or polishing and retain any reputable certification rather than interpreting shine as proof manufacture.

Authenticity and condition

A representative 1978 photograph can illustrate an included design but cannot certify another specimen or assay its silver. Supply complete obverse, reverse and edge photographs with measured weight and diameter for identification. Patterns, plated pieces, cast copies and uncertain regional issues require separate investigation. The pictured faces do not independently prove an unseen edge or finish.

Selling this coin

Sort 100 pesos pieces by actual type, issue year and composition before adding quantities. Keep different standards and uncertain coins in separate groups. CashForCoins’ existing photo-appraisal link can carry the selected coin and quantity into an enquiry. Authentication, condition and collector demand may affect an actual offer alongside metal; this educational calculator is not a buying bid.

Sources and calculation methodology

The designated reference World Silver melt reference supplies 27.77 g gross mass, 0.72 silver fineness and 0.6428 reference fine silver troy ounce. Matching dated KM 483.1 and 483.2 records supply actual annual rows, 39 mm diameter, designs and mint notes. Thickness and the identities of remaining alloy metals are not independently verified. The licensed image page rounds gross weight to 27.78 g; the calculation preserves 27.77 g from the designated reference melt table and both dated reference types. The 20 g reverse legend describes fine metal rather than total alloy mass. Dates are read from matching annual rows rather than inferred from a broad melt-group heading. The reference valuation tables, mintages and articles are not republished. The proposed main obverse/reverse photographs are credited to Numismatica Quetzalcoatl under CC BY 4.0 on Numista; unrelated edge and comparison photos are excluded.

The actual dated representative photographs and independent reuse permissions were inspected. Complete faces are retained, with WebP conversion and no enlargement, retouching or synthetic reconstruction; joined source images are split with complete rims. These photographs do not assay another specimen. Actual staging rendering and calculator acceptance are separately recorded.

Common questions

Which actual years are included?1977–1979. Matching annual rows establish these years; unlisted dates are not filled from a broad series heading.
How much silver is in three matching coins?1.9284 reference fine silver troy ounces and 83.31 nominal gross grams. This is a metal-content calculation, not authentication or a collector valuation.
Can another coin of the same denomination have a different silver content?Yes. Later base-metal 100 pesos, copper patterns, uniface patterns and replicas must not inherit this profile’s metal calculation. Confirm the exact type and alloy before combining quantities.

References

Issue-year references

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

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