Silver Ounce 1980, Coin from Mexico - detailed information

The obverse of the coin shows at its centre a screw press with two flyweights, as used for coin minting before modern presses were introduced.

Around above, the name of the mint: CASA DE MONEDA DE MEXICO (the Mexican Mint).

Below left, the date of issue 1980.

The border is toothed, with staggered sizes of the teeth.

The obverse of the coin shows at its centre a pair of scales as historically used to measure weight.

Around the rim, the inscription UNA ONZA DE PLATA PURA (one troy ounce of pure silver).

Above left, LEY .925 (purity 92.5%). Below the scales, PESO 33.625 GRAMOS (weight of 33.625 grams; "peso" in this context is "weight" and not the currency name).

Below that, the Mo mint mark of the Mexican Mint (large letter M above which a small o).

The border is toothed, with staggered sizes of the teeth.

The 1980 coins are considered "Type V" (or "Type 5"); there is close spacing between DE MONEDA on the obverse, and the left scale pan on the reverse points to the U of UNA (and not between U and N as Krause says).

This was the last year these coins were made. In 1982, the mint started issuing the Libertad Silver Onza instead.