Very nice and intetesting gun for sure. I noticed on one of the picures of the under the barrel flat a B inside a diamond. So I wonder if at some point the gun went back to S&W and got the longer barrel and/or Made in USA stamp when back at factory. I see another list stating that 200 S&W 1917's with 5.5 inch barrels were made in 45 long colt. I can not add any additional insight to this most interesting subject. Wish I could find something like this in a LGS or pawn shop around my neck of the woods. They would have no idea what it is. This is exactly how I bought my pre Woodsman King super target. They called Colt and asked, the rep. on phone at Colt replied "these are aftermarket sights some people had put on their guns way back when and add no value to the gun" This is exactly what the guy behind the counter told me and I preceded to buy the gun.