Phone call a few minutes ago. It apparently is not a Colt Walker but is a reproduction, my friend has two Colt Walker cylinders and a marked barrel and they do not fit the frame. The cylinder is roll engraved, my bad, due to my terminology ignorance. It is still a fair wall hanger and is the reason I bought it. I appreciate your input and I will stick to S&Ws about which I know a little. It was a fun trip.