Silver Mexican Onzas pre-libertad (20 Ounces) 1980 Onza Troy De Plata Pura Start Price USD 50.00 Current Price USD 295.00 Time Left - Bid Count 4 Buy It Now Price - Reserve Price - Start Time Friday, August 29, 2008 End Time Friday, September 05, 2008 Location smithtown, NY See more about 'Silver Mexican Onzas pre-libertad (20 Ounces)' Description For sale 20 silver mexican onzas On the front Casa De Moneda De Mexico 1980On the other side Una Onza Troy De Plata PuraLey .925 Peso 33.625 GramosThe silver rounds on this page are official mintages of the Mexican Mint. The onza was first produced in 1949 as a medallic issue featuring a coin press on the obverse and a balance scales on the reverse. Onzas of this design were produced in 1949 and again in 1978, 1979, and 1980. The libertad featuring the winged angel of victory has been produced since 1982. Place a Bid!