Mexico • 1 peso
A matching Mexican .800 silver peso contains 0.4663 reference fine silver troy ounce using the designated reference melt table. Actual included years are 1918 and 1919. Confirm denomination, complete date, both designs, nominal 18.13 g mass and 34 mm diameter before combining a quantity. Different Mexican coins sharing the denomination can contain different amounts of silver.
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.
Actual source-reviewed issue years for this exact denomination, design and metal/weight scope. Overdates, mint combinations and proof availability remain type-specific; specimen photos and measurements do not certify other examples.
Formula: specified fine-metal troy ounces × quantity. Dollar melt value additionally requires an approved current metal price.
The reference describes the Mexican national arms. Read the country legend and pair the arms with the correct peso reverse and date before applying silver content.
The peso value and date appear within a three-quarter wreath with a Liberty cap above. The matching dates are 1918 and 1919, including a separately recorded 1918/7 overdate.
The 18.13 g, .800 peso belongs to a heavier standard than the subsequent 16.66 g, .720 KM 455 peso. Both have a 34 mm diameter and familiar cap-and-wreath design, so size alone does not separate their silver content. Later portrait pesos use further distinct alloys and masses.
Match the complete 1 peso denomination and included issue years. The designated standard is 18.13 g gross mass, 0.8 silver fineness and 34 mm diameter. Keep unrelated alloys, gold coins, regional issues, patterns and replicas separate. Wear can reduce mass; appearance, a magnet or a household scale cannot alone determine precise alloy or authenticate the coin.
Three matching coins contribute 54.39 nominal gross grams and 1.3989 reference fine silver troy ounces. The calculator uses 0.4663 oz per coin rather than treating total alloy mass as pure silver. Dollar melt pricing requires an approved current market quote; absent pricing is not shown as zero. Collector demand and condition remain separate from metal content.
The 1918 decree specifies an alloy of 80% silver and 20% copper. It gives 18.125 g gross mass, containing 14.5 g silver, with a 34 mm diameter. The reference’s designated melt reference rounds the gross mass to 18.13 g; the calculator uses its 0.4663 fine silver troy ounce reference. This difference in displayed mass does not create another physical type.
Specific annual years are 1918, 1919. The reference supplies 1918, 1918/7 and 1919 rows. The 7 under the overdate does not add 1917 as a matching KM 454 issue. Unlisted patterns or proof variants are not assumed.
An attributed overdate, die variety, date, finish, condition or provenance may influence collector interest independently of silver content. The metal calculation cannot determine grade, rarity or collector value. Avoid polishing or cleaning; preserve original surfaces, any established provenance and reputable certification. A worn piece and an uncirculated example of the same nominal standard can have different collector values.
A photograph of another denomination or alloy must not be used as this type’s illustration. Complete authentic obverse, reverse and edge views, measured mass and diameter help investigate a specimen but are not a silver assay. Plated pieces, cast copies, unlisted patterns and doubtful dates require individual attribution. Avoid cleaning or inferring a proof finish from shine.
Sort 1 peso coins by complete date, design and nominal metal standard before entering quantities. Send clear photographs of both sides, plus edge photographs and measured weight where possible, when requesting a CashForCoins appraisal. Preserve unusual die details for individual review. An offer can depend on authenticity, condition and collector demand alongside metal content. The melt calculation is an educational reference.
The reference’s designated World Silver melt reference gives 18.13 g gross mass, .800 fineness and 0.4663 fine silver troy ounce. Its matching dated KM 454 rows establish 1918 and 1919, including the 1918/7 overdate. The decree of November 13, 1918, reproduced by the Federal Reserve Board in January 1919, gives the alloy as 80% silver/20% copper, nominal 18.125 g gross mass and 34 mm diameter. The guide retains the reference’s calculation and explains the original decree’s additional precision. An overdate undernumeral is not a separate annual issue.
Content maintained by CashForCoins. Last substantive record update: 2026-10-12. Report a specification or attribution issue through our contact page.
Photo credits and rights on the linked coin profile.
Mexico • 72% silver; remaining alloy metals not independently verified
Issue years: 1920–1927, 1932–1935, 1938, 1940, 1943–1945
Fine silver: 0.385600 troy oz
Photographs can help identify your coin. An appraisal may consider authenticity, condition and collector demand as well as metal content.
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