Speaking technically, if the Colt letter in the lower photo pertains to this revolver, it is a “Frontier Sixshooter” chambered in .44 WCF (Winchester Centerfire) also known as .44-40 Winchester. This revolver would, if that were the case, take the same round as its owner’s Winchester Model 1873 (or Model 1892), making it convenient to need only to carry one type of cartridge for both rifle and pistol. The serial number indicates it was made in 1898.

HT: Daily Timewaster.