George, the years are best guesses. 4101F is a bit unusual, but a Folsom gun. If you number does not have another digit, probably made in 1920, give or take. As to no. 480, probably 1898. The 46,000 range gun somewhere between 1915-1919.

Last edited by Daryl Hallquist; 08/28/13 03:29 PM.