I have a revolver that has been passed down to me. I believe it's a 1905 but not sure. It does not have any S&W stamping on the frame. It's a six digit serial number with no letters. There is a chance the barrel was swapped out for the 2" barrel that is currently on it. Serial number on the cylinder matches the serial number on the frame. There are no markings under the grip panels. I believe it's a five screw.