1940-1948: Nickel plated steel knurled handle with (9) bands of knurling, blued shaft and long tapered blade.
1947-1958: Blued steel knurled handle with (8) or (9) bands of knurling, black oxide shaft and long tapered blade.
1956-1960: Aluminum knurled handle with (8) or (9) bands of knurling, black oxide shaft and long tapered blade.
For the pre war K22 Outdoorsman:
1921-1939: Nickel handle with (7) bands of knurling with blued shaft. These S.A.T.s were 2/3 the size of the post war S.A.T.s.