After 1978.
The suffix SA was used from 1956 to 1978. The prefix SA started after 1978, so I would guess a year or so after 1978.
if double action revolver it was probably made about 1923
what is the manufacture date of a .38 police positive special serial number b 81
this question should be under Colt Firearms section
You did not provide a serial number.
1970
1959
and the model is..................................
Colt police positive special was made in 1915
You can find out at Proofhouse.com
@ 1969
1980