You're going to pay 100.00 - 150.00 for a letter that simply says' " shipped to the commanding officer at....." Not worth the money IMO and I have lots of US cavs.I just bought a U.S. marked Colt Single Action Army. I was told it was made in 1880, from it's serial number but would like to make sure. I'm thinking of getting a factory letter. How much do they cost and how do I get one?
Post some pics of insp. stamps, serials, barrel address, front sight and grips and if it looks "right" you might consider sending it to John Kopec for authentication.