Around 1885.
1970
1959
about 1976
and the model is..................................
1958
Proofhouse.com has sn tables you can look it up on.
What is the manufactures date on an Iver Johnson revolver serial # Q18255
if double action revolver it was probably made about 1923
1974 Source: mine :) my precious darling I'm a gun specialist
Proofhouse.com has Colt serial number tables.
1966
@1969