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Index/Topics/Pre-1965 U.S. Dimes Composition

Pre-1965 U.S. Dimes Composition

The composition and specifications of pre-1965 U.S. dimes, including their metal content and physical characteristics.

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Jan 28, 2026
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What are official weight and dimension specifications for U.S. silver dimes (pre‑1965) and how much variation is acceptable?

(commonly called “90% silver” dimes) were specified by the to be struck in a 90% silver / 10% copper alloy, with a standard total weight of 2.50 grams and a diameter of 17.9 millimeters (0.705 inch) —...