Mexico 1 Reale U. Silver Colonial Period Coin. These colonial period coins circulated freely in the many New World colonies of Spain. With many of them lost in shipwrecks it’s difficult to know how many remain in existence. Weight: 3.30 Grams, Fineness. 903 Fine Silver, Diameter: 20.50 MM. Thank You for looking. Be sure to add letsshop626 to your favorites list. Check out our other items.