Colt Peacemaker refers to a revolver. 70 series pistol in 22 refers to a semi-automatic. Which one do you mean?
Peacemaker .22
1971
@1974
About 1974.
Made about 1974.
@ 1973
1971
1974
1971
A Colt peacemaker .22 model with that serial number was made in 1971.
It was produced in 1974.