1957 Roosevelt Dime Silver Composition
.Mintage: 161,407,952
.Minted at: Philadelphia (No Mint Mark)
.Designer - Engraver: John R Sinnock
.Metal Composition: 90% Silver - 10% Copper
.Finesse: 0.900
.Diameter: 17.9 mm
.Mass / Weight: 2.5 grams
.Thickness: 1.1 mm
.Variety/Rarity: Philadelphia.Type1 (Silver)