Hello, this is my first post here so bare with me. I have acquired an 1873 Winchester, to my best ability I have been able to narrow it down to one that was manufactured in 1879 and it is almost undoubtedly a sporting model. The serial number is 28386. I do not know which model it is, as far as I can read there are three makes. I cant imagine mine being made in 1879 would be anything other than a first model but I have no clue. The rifle has a slide mechanism in the butt that holds extra rounds, it has the Winchester patent information on the barrel. The barrel is octagonal (or at least half). From my own estimation (and I am far far from an expert) the gun is 40% - 50% and has a slight defect in with the hammer which will be fixed after this weekend with no replacement parts. First, can somebody help me determine the round this gun takes? I seem to find a ton of different information. Secondly, I don't plan to sell this gun but can somebody give me a conservative value for an operational model 1873 40% - 50% sporting model. As far as I can tell there is nothing special about the model I have as far as factory "add ons" except for the compartment in the butt (which may be a stock component for all I know). I have an incomplete but very nice Winchester collection and I want to know all I can about them. Is there a way to get my 1873 certified or get a certificate of some sort? Thanks in advance for all of the responses.