The HAHN 45 was bought out by Crosman and made between 1958 and 70 it became the model "Frontier 36" in 1970 - 1975. You will need to state the condition of the pistol to get an estimate of value.
Serial number shows it is a single action revolver made someime after 1978.
1927
1895
1962
depends on the model revolver. single action just in front of trigger guard............ modern revolver bottom of butt............
1970
1959
1897
about 1907
about 1880
1910
and the model is..................................