These stocks were made for a square butt Model 1905, since they have the large gold medallions. They were put on revolvers from 1911 to 1920. I keep a list that was compiled from Jim Supica's SCSW Third Edition for K framed guns and it is a good guide, but I am sure there are exceptions.

Hard Rubber - 1899-1940
Diamond Wood-flattened top-No Medallion - 1904-1910
Diamond Wood-Large Gold Medallion - 1911-1920
Diamond Wood-Round top-No Medallion - 1920-1929
Diamond Walnut-Large Silver Medallion - 1929-1941
Diamond Walnut-Small Silver Medallion - 1946-1950
Magna Stocks - 1950-1967