Not sure, there is a C by the SN at frame and barrel joint, and what looks like a couple of proof marks, barely legible.
Or shoot it off my back deck.
When I lived in Idaho in the mid 70's, thats exactly what we did.
Here is the C by the SN and under the barrel what I thought was a bad stamp may be the barrel code, looks like CP, dont now when that would be.
Year | Mark | Year | Mark | Year | Mark | Year | Mark | Year | Mark | Year | Mark | Year | Mark |
1940 | 1953 | IX | 1966 | XXII | 1979 | AE | 1992 | BB | 2005 | BZ | 2018 | CT | |
1941 | 1954 | X | 1967 | XXIII | 1980 | AF | 1993 | BC | 2006 | CA | 2019 | CU | |
1942 | 1955 | XI | 1968 | XXIV | 1981 | AH | 1994 | BD | 2007 | CB | 2020 | CZ | |
1943 | 1956 | XII | 1969 | XXV | 1982 | AI | 1995 | BF | 2008 | CC | 2021 | DA | |
1944 | 1957 | XIII | 1970 | XXVI | 1983 | AL | 1996 | BD | 2009 | CD | 2022 | DB | |
1945 | I | 1958 | XIV | 1971 | XXVII | 1984 | AM | 1997 | BI | 2010 | CF | 2023 | DC |
1946 | II | 1959 | XV | 1972 | XXVIII | 1985 | AN | 1998 | BL | 2011 | CH | 2024 | DD |
1947 | III | 1960 | XVI | 1973 | XXIX | 1986 | AP | 1999 | BM | 2012 | CI | 2025 | DE |
1948 | IV | 1961 | XVII | 1974 | XXX | 1987 | AS | 2000 | BN | 2013 | CL | 2026 | DF |
| 1949 | V | 1962 | XVIII | 1975 | AA | 1988 | AT | 2001 | BP | 2014 | CM | 2027 | DH |
1950 | VI | 1963 | XIX | 1976 | AB | 1989 | AU | 2002 | BS | 2015 | CN | 2028 | DI |
| 1951 | VII | 1964 | XX | 1977 | AC | 1990 | AZ | 2003 | BT | 2016 | CP | 2029 | DL |
| 1952 | VIII | 1965 | XXI | 1978 | AD | 1991 | BA | 2004 | BU | 2017 | CS | 2030 | DM |
