| Prefix | Years | Typical Models | |--------|-------|----------------| | S | 1945–1968 | N-frames, post-war | | N | 1969–1986 | N-frame magnums (29, 57, 629) | | K | 1946–1983 | K-frame revolvers | | J | 1969–1983 | J-frame snubbies (Model 36, 60) | | D | 1968–1978 | Model 10 (M&P) | | C | 1948–1967 | Model 10 earlier | | 1A–9A | 1980–1983 | Late J-frames | | A, B, C, D (1–3 letters) | 1980–present | Autoloaders (3rd gen, M&P) | | R, T, V | WWII | Victory Model (38/200) |
: Used from 1946 until 1968.