Here is a Vintage Mens Mexico 1980 Onza Peso Set In A Sterling Silver Key chain. Coin and chain weighs 103.2 grams, over 3 troy ounces. Measures 7 3/4  inches long. Keychain is marked Mexico 925 16-24. Shows some use wear. Overall in very good condition....and fast shipping, most of the time same day shipping.         Don't Forget to Check out my other items Listed.