10 Big Silver Mexico Un Peso Coins! This historic Un Peso silver coin became the last circulating silver peso in Mexico before the coins were debased to copper nickel and finally to bronze and aluminum. Each coin weighs 16 grams, contains 1.6 grams of silver and features the portrait of Jose Morelos, commander of the Mexican Forces in the War for Independence. The buyer will receive 10 coins like those shown in the photos. I will make sure you get a very good selection. We offer combined shipping.