I found out that there should be 3 spots where the serial number is located and found the last one under the barrel, the number matches the other two but this one has what looks to be a B and then a space and then the serial number, anyone have an idea what the B stands for?
I didn't know off hand but asked your question on the Smith & Wesson forum. The consensus from the experts is that it means the gun shipped with a blued finish.


















































