To determine the approx. year this firearm was manufactured the serial number is required. The model 66 (.357 Stainless Combat Magnum) was in production from 1970 ( I believe) until 2004.
1978-79.
93-94 time frame.
No such Colt model
The gun was made in 1922.
1970
made in 1982
@ 1975
Proofhouse.com has sn tables that you can use.
No known sn data published.
colt .380 mod. 1908 serial #112840 was mfg, between 1933 and 1934. hope this helps. don
Your serial number indicates that your Marlin mod 60 rifle was made in the year 1978.
your trapdoor was made in 1878