You must call Colt.
1981
1995
1956
1957
manufacture date of the python is based on serial number.....................
That Colt python was made in 1975.
That serial number is listed for a Colt python made in 1977 (48301E to 86200E)
You will have to call Colt
The date of manufacture is determined by the Colt model type and serial number. See: www.proofhouse.com/colt/index.html
Contact Colt Customer Service for a date of manufacture- no published data.
The date of manufacture of Colt 1903 Hammerless .32 is 1916.(193000-234999)