Mexico • 1 peso

Mexican Second Republic Gold One Peso — 1870–1905

Normal Mexican Second Republic gold one peso contain .0476 reference fine gold troy ounce at 1.692 g gross and .875 fineness. Actual dated normal records collectively cover every year 1870–1905. The national eagle appears on several silver and gold denominations, so identify the complete denomination, dated type and mint before assigning this standard. Later Mexican gold coins with a similar denomination can have another mass and purity.

Obverse of a Mexican 1880 gold one peso coin showing the national eagle and date.
Obverse — 1880 gold one peso specimen (Banco records an 1880/70 overdate), obverse and reverse. Images: Banco de México, Colección Numismática (inventory 5080). Banco records this individual specimen at 1.7 g and 15.0 mm. Preserve the mapped the reference nominal 1.692 g, .875 fineness and .0476 reference fine ounce. These observed specimen measurements are not an additional issue variant and do not populate an otherwise unestablished family dimension. The1880/70 attribution is catalogue metadata; the image is not asserted to independently resolve every underdate digit.
Images: Banco de México, Colección Numismática, inventory 5080, 1880; reproduced under its published collection use policy. · Image source · Banco de México published collection reproduction permission
Reverse of a Mexican 1880 gold one peso coin showing the value within a wreath and .875 marking.
Reverse — 1880 gold one peso specimen (Banco records an 1880/70 overdate), obverse and reverse. Images: Banco de México, Colección Numismática (inventory 5080). Banco records this individual specimen at 1.7 g and 15.0 mm. Preserve the mapped the reference nominal 1.692 g, .875 fineness and .0476 reference fine ounce. These observed specimen measurements are not an additional issue variant and do not populate an otherwise unestablished family dimension. The1880/70 attribution is catalogue metadata; the image is not asserted to independently resolve every underdate digit.
Images: Banco de México, Colección Numismática, inventory 5080, 1880; reproduced under its published collection use policy. · Image source · Banco de México published collection reproduction permission

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
1 peso
Composition
87.5% gold; alloy remainder not individually attributed
Gross weight (grams)
1.692
Fineness
0.875
Fine-metal weight (troy oz)
0.0476
Mint
Multiple Mexican mints; attribute actual mint and assayer letters
Mint mark
Read dated mint and assayer marks
Restrikes
Normal .875 Second Republic issues only; trials, patterns and later .900 gold denominations excluded
Issue years
1870–1905

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.

Source precision
The reference designated World Gold and all seven normal mint types agree on 1.692 g gross, .875 fineness and .0476 reference fine gold troy ounce. Actual annual rows collectively verify every engraved year 1870–1905. The melt-table 1872 start omits dated 1870/1871 issues. The selected 1905CnP entry is explicitly unconfirmed; the 1905MoM annual entry independently verifies the final family year. Catalogues do not establish a diameter or thickness in the inspected normal records; neither dimension is invented. URLs and identity keys remain retained despite their narrower original research envelopes.

Calculate this coin’s metal content

One coin contains 0.0476 troy oz of fine gold.

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

Obverse: identify the front

The normal the reference types describe a facing eagle with a snake in its beak. REPUBLICA MEXICANA identifies the republic around the national emblem. Eagle details can vary between dies and mints; a familiar Mexican emblem alone does not identify metal, denomination or the correct historical standard. Keep the full rim, legends and the opposite face available when comparing a specimen with a catalogued issue.

Reverse: identify the back

The value appears within a half wreath on these normal gold one peso. Read the denomination, complete date and mint/assayer characters together. The scales and liberty-cap imagery associated with some contemporary silver coinage should not be substituted for the documented gold reverse. A smaller or larger denomination may carry a similar eagle but a different fine-gold quantity.

History and purpose

Mexico’s decimal Second Republic gold coinage included several peso denominations and regional mint/assayer combinations. This guide groups matching normal metal standards while preserving each dated mint variety for identification. Later .900 gold pesos and modern bullion belong to different coin families. A denomination reused in another period is not evidence that the same historical gold-content calculation applies.

How to identify this variant

Confirm the gold Second Republic design and the exact one peso denomination, then record the entire dated mint/assayer combination. The nominal mass is 1.692 g and the gold fineness is .875. Those inputs describe the matching standard; they are not an assay of a worn, damaged or mounted specimen. Reference diameter and edge remain unverified in the inspected records and must be established before a physical comparison is treated as complete.

Understanding its metal content

The reference supplies .0476 reference fine gold troy ounce for the matching normal coin. Three correctly identified pieces total 0.1428 reference fine ounces and 5.076 nominal gross grams. Gross mass multiplied by .875 gives 1.480500 fine grams, approximately 0.047599 troy ounce per coin. That arithmetic is disclosed separately from the rounded reference AGW. The unspecified alloy remainder is not additional gold.

Dates, varieties and composition changes

Accepted actual engraved issue years are every year 1870–1905, based on the union of annual rows, not an automatic fill of a broad heading. Mexico City has each family year 1870–1905, including overdates and large/small-date entries. Guanajuato includes an 1898 five-centavos-eagle obverse mule. A catalogued 1900/800 overdate refers to engraved digits, not .800 gold purity. Culiacán’s selected 1905CnP row explicitly requires confirmation and is excluded as an established mint/date combination; 1905MoM is independently listed. An individual mint did not necessarily strike every family year. Keep overdates, mint-letter changes and unusual die combinations attributed separately without inventing a rarity or market premium.

Melt value versus collector value

A dated regional mint issue, overdate or die combination may need individual numismatic appraisal before a metal-content sale. Preservation, cleaning, mounting and retained certification affect that assessment. This guide assigns no grade, scarcity claim, current catalog price or expected premium. Keep each coin’s full attribution and original surfaces intact instead of treating an unexamined historical lot solely as scrap.

Authenticity and condition

Photographs, yellow color and a scale reading cannot authenticate a coin by themselves. Document the complete faces, rim and edge without cleaning, acid testing or scraping. Confirm the catalogued date/mint combination and obtain the missing physical reference dimensions where needed. Exclude uncertain pieces, altered denominations and unidentified replicas from a confirmed nominal collection total until examined.

Selling this coin

Separate these .875 Second Republic gold issues from later .900 pesos, silver pesos and modern bullion. Supply dated mint/assayer notes, full-rim both-side photographs and any original certification through the existing CashForCoins appraisal process. A nominal fine-gold quantity helps describe a lot; it is not a guaranteed offer. Missing market-provider data must remain unavailable rather than displaying a zero-dollar melt value.

Sources and calculation methodology

The reference designated World Gold and all seven normal mint types agree on 1.692 g gross, .875 fineness and .0476 reference fine gold troy ounce. Actual annual rows collectively verify every engraved year 1870–1905. The melt-table 1872 start omits dated 1870/1871 issues. The selected 1905CnP entry is explicitly unconfirmed; the 1905MoM annual entry independently verifies the final family year. Catalogues do not establish a diameter or thickness in the inspected normal records; neither dimension is invented. URLs and identity keys remain retained despite their narrower original research envelopes. Seven matching normal the reference mint-type records were read individually. Actual annual rows and selected singleton rare dates were retained separately; prices and mintages were not copied. Unconfirmed catalogue entries do not establish an issue.

Common questions

Does a Mexican peso denomination identify its metal?No. Mexican pesos include distinct silver and gold families. Match the full dated type, denomination and material before calculating metal content.
Did every mint issue every year listed?No. The family years are the union of actual dated mint records. An individual mint or finish must be checked separately.
Can later .900 Mexican gold use this .875 record?No. Later issues have separately documented weights and purities and need their own coin identity and calculation.

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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