Jimmy, I'll give you a provisional reply while we are waiting for somebody knowledgeable to come along. I am pretty new to Colts as well, and for some reason I am finding the learning curve for DA revolvers of the late 19th century and the first half of the 20th to be kind of steep.
I think you have the model called the Colt New Army and Navy. It is chambered in .38 Long Colt. The charge holes may be bored straight through and will chamber a .38 Special or a .357 Magnum, but these last two rounds MUST NEVER BE FIRED IN THIS GUN.
The patent stampings show that the gun necessarily postdates 1895, and the serial number, as you seem to have found at Proofhouse, says 1898.
This is the model with side plate on the right, correct? And does the cylinder rotate anti-clockwise like a S&W instead of clockwise like most DA Colts?
If I'm wrong, someone who really knows these guns will be along to correct me and inform you in short order.
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