Having difficulty finding the Serial Numbers and exactly what it is. I know that it is a Colt(for sure) and that it looks like a New Service .45 but I want to be confident on it`s I.D. Bought it at a Yard Sale. The guy was using a metal detector and found it wrapped in a cloth in the ground, loaded. I was looking at some photos posted on the internet and it looks exactly like the New Service models but without the ring and bolt at the bottom of the handle. Any help would be appreciated, Thanks.