It could be factory. You will need a letter from Colt. Even then, if it wasn't done by a Master or Expert you won't know the name. If it's aftermarket, it should be signed somewhere.
Do you have a colt python?
Does not exist. Colt makes the Python, not S&W
50-5000 usd
I just bought one - about $850
The value of a chrome plated colt python with a 4 digit serial is $800.
The chrome plated colt python 357 magnum is more than $800.
made about 1969
between $950 - $1250 between $950 - $1250
Depending on condition, paperwork, box and grips, between $1,500-$2,500.00
worth depends on condition. check prices at; Gunbroker.com and : Gunsamerica.com
probably some time after it was made. the military model was not nickel plated.
assuming it was nickel plated after market, it would lose value for that reason.....