Impossible to answer without the serial number.
@ 1969
1980
@1977
1966-67
Impossible to answer without the serial number. You will have to call S&W
@1975
Need a detailed description
@ 1960
K 7981 smith&wesson
1880
1969
The serial number C642424 was assigned to the Smith and Wesson models 10,11,12,45,Air crewman and there pre model variations.The year of manufacture for your serial number is between 1963-1964.