1949-Mo Mexico 1 Onza MS63

1949-Mo Mexico Silver Onza — MS-63

Issuer: Banco de México
Mint: Casa de Moneda de México
Date/Mint: 1949-Mo
Composition: .925 Fine Silver
Weight: 33.625 grams
Actual Silver Weight: 1.0000 troy ounce
Diameter: Approximately 41.5 mm
Mintage: 1,000,000
Grade: MS-63

The 1949-Mo Onza is one of Mexico’s most historically important silver issues and is widely regarded as the first government-issued silver bullion coin containing a full troy ounce of pure silver. Unlike a modern Libertad, this piece was struck in sterling silver, so the planchet weighs 33.625 grams to deliver exactly one troy ounce of actual silver. Apparently, displaying both the purity and the math directly on the coin was once considered helpful. 

The obverse features a traditional screw press surrounded by the inscription CASA DE MONEDA DE MEXICO and the date 1949. The reverse prominently states the coin’s silver content and fineness, leaving absolutely no mystery about what it is—an approach modern bullion marketing departments might find dangerously straightforward.

Graded MS-63, this example remains fully uncirculated with no evidence of actual wear. Original mint luster is present across both sides, although it may appear somewhat satiny or subdued because these pieces were produced as practical bullion rather than miniature mirrors intended to impress registry-set judges.

The central devices remain sharply defined, including the screw press, lettering, numerals and surrounding decorative elements. Minor weakness in isolated areas may be attributable to the original strike rather than circulation. On a large, open design such as this, the fields provide every contact mark with a spacious stage on which to perform.

Scattered bag marks, small abrasions and light handling marks are consistent with the MS-63 grade. These pieces were commonly stored and transported in quantity, meaning they frequently introduced themselves to neighboring Onzas without first requesting permission. The marks are noticeable under examination but do not materially disrupt the coin’s overall appearance.

The rims remain complete, the inscriptions are bold and the surfaces show no wear that would reduce the coin below Mint State. Assuming the coin is free from cleaning, polishing or other surface alteration, it fits comfortably within the Select Uncirculated MS-63 designation.

Overall, this is a solid, original example of a historically significant Mexican silver issue: fully Mint State, attractively preserved and considerably nicer than the average survivor that spent several decades being shuffled around in a canvas bag like loose change at a casino.