Hello, all. My dad has got a few questions about his Colt Navy London revolver, so I'm trying to help him out with your guys' support. It's in good to great condition with matching serial numbers on all parts, #41894. On the cylinder is an etching of naval ships and stamped on the gun are the words "Address Col. Colt London," along with the letters "V.P." My dad's curious as to how to find out more about this gun's history and what a revolver like this would fetch at retail. Any help is much appreciated! Thanks again.