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.
After 1978.
1877 if it's a Single Action Army. Nothing special about the serial number.
Was produced around 1916.
this question should be under Colt Firearms section
100-1500 USD depending on specifics
double action colt revolvers 1905 - 1978 Serial # 507493 made about 1925
About 1913 for a Colt police positive special with that serial number.
your Winchester model 1894 was made in 1940.
under double action model made about 1920
if double action revolver it was probably made about 1923
Impossible to answer. What special edition? What is the serial number?
your colt detective special dates to the year 1949 by the serial number provided.