Depends on the model, age, condition.
pt (patent) fa (firearms) mfg (manufacturer)
colt patent firearms
Patent Firearms PT and FA (as used by Colt)
Colt............................
I believe 'pt' stands for patent, as in Colt patent firearms
Colt
Proofhouse.com has Colt sn tables you can look at.
You will have to provide caliber and ALL markings.
10-400 usd
Nothing.
I have a colt pt fa mfg co hartford ct usa 15374 SHOT GUN. I'm really not sure what I have, need help. Thanks. Terry Martin
10-1000 usd