MS65 | MEXICO. Republic, 1823-date.
Silver 1 Onza, 1980. Mexican Mint.
The coin mint called "de balancín" (of sway), was used in Mexico Mint to make their first coins. This device uses the rotation of a pole on top with weight on a side to get enough speed to force a spiral down and mint the coin (later updated to use steam and then electric motor but the method was the same).
Some people think that these rounds contain more than one troy ounce of silver and are led to believe that they have scored two and a half extra grams of silver for free. The reason that these medallic pieces weigh 33.625 grams (instead of one troy ounce, 31.103 grams) is that the silver alloy used in them is, unusually, only .925 pure. 33.625 grams multiplied by .925 purity = 31.103 grams of pure silver.
Coin mint called "de balancín" (of sway) in the center, CASA DE MONEDA DE MEXICO 1980. / Scale as a centerpiece with the weight as legend around, the purity at the top-left, and the weight in grams at center bottom, and mint under. Edge reeded.
In secure plastic holder, graded PCGS MS65 , certification number 47713242.

PCGS population in this grade: 209.
PCGS population in higher grade: 171.
Reference: KM-M49b.
Mintage: 6,104,000.
Diameter: 41.5 mm.
Thickness: 3 mm.
Weight: 33.625 g.
Composition: 925/1000 Silver.

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