Target stocks for N-frame revolvers were available in late 1952 (a few pairs were used earlier), but not cataloged until 1955. The relieved area on the left panel appeared in 1958/59, but was used in 1956 on coke bottle stocks on the 44 Magnum. The diamond around the escutcheon and nut disappeared in very early 1969. The overall shape of the stocks changed by 73/74 as the amount of wood where the stocks meet the frame near the trigger guard was reduced.

This is a lot of stock history in a few sentences, but a full chapter in a book could be devoted to post-war N-frame stocks.

Bill