As already mentioned, ~1941.
1942 to 1945 would have a V prefix.
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Is that so? I was told by S&W my Model 10-5 was made in 1962, but it has a D prefix...weird
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10-5's were made from 1962 to 1977. "D" prefixes ran from 1968 to 1977.
So yours cannot be earlier than 1968.
Jim