Q: How much silver by weight in 1964 and older dimes?

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Presuming that you are referring to US dimes issued between 1875 and 1964 (dimes older than 1875 had different weights and/or fineness), dimes weigh 2.50 grams and are 90% silver (the remaining 10% is copper). This means that the ASW (Actual Silver Weight) is 0.07234 troy ounces. Thus, it would require 14 dimes (this number is rounded up; the precise number is 13.8236 dimes) to have one troy ounce of silver.

Modern copper-nickel dimes weigh 2.27 gm. Older (1964 and earlier) 90% silver dimes weighed 2.5 gm.

U.S. dimes dated 1964 and earlier contain 90% silver with 10% copper. Dimes dated 1965 and after contain absolutely no silver.

Dime minted before 1965 contain 90% silver. With a total weight of 2.5 grams, that makes 2.25 grams of silver per dime.

No. The last year for silver dimes and quarters was 1964.

Related questions

1964 and older US dimes contain 90% silver.

Yes, all dimes, quarters, half dollars, and silver dollars 1964 and older are 90% silver.

1964 was the last year for silver dimes.

Dimes were struck in silver from 1796 to 1964. From 1992 to date Silver Proof Sets have been made that have silver dimes in them.

Silver dimes were last minted in 1964 in the US.

Roosevelt dimes from 1946 to 1964 are 90% silver. The ASW. (Actual Silver Weight) is 0.07234oz of pure silver.

1964 is the last year for silver dimes.

Yes, U.S. quarters and dimes struck in 1964 or before are 90% silver.

Dimes and quarters, yes. Nickels, no. 1964 was the last year for silver dimes and quarters, and nickels only contained silver during WWII.

The last year for silver dimes and quarters was 1964.

US dimes were struck in silver from 1796 to 1964.

Simple answer is no. 1964 was the last year of 90% silver dimes.