1978 Mexico CASA DE MONEDA "Una Onza" 33.625 Grams .925 SILVER Bullion Coin

1978 Casa De Moneda 33. 625(ASW 1oz.) .925 Silver. Key date. Only 280,000 coins minted. *The coin in the photos is the exact the winner will receive* Thanks for looking.
Most of these are uncirculated, but some were passed hand to hand as merchants gradually began to accept fiat coinage.
On the obverse, the coin shows what appears to be a side view of a smelting crucible, surrounded by the legend “Case De Moneda De Mexico” from 7:00 to 5:00. The date is located about 8:00, written horizontally (while the other legend curves around the inside of the rim).
Mexico - Onza 1978 Silver Bullion Peso Obverse
The reverse shows a balance scale, with the left side tilted strongly downward. It reads “Una Onza Troy De Plata Pura” from 8:00 to 4:00. The purity “Ley .925″ is stamped above the left scale at 10:00. Below the scale is the legend “Peso 33.625 Gramos” over the Mexican City mint mark (an M with a circle over the center dip).
Mexico Onza 1978 Silver Bullion Peso Reverse
Date: 1978
Mint Mark: Mo (Mexico City)
Country of origin: Mexico
Composition: 92.5% silver (presumably 7.5% copper)
Size: 41.7 mm diameter, 3.2 mm thick
Weight: 33.625 (1 oz ASW)
Other details: There are two varieties of the 1978 onza. The Type I is the most common, and it has a slightly higher placement for the word “Una”
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