It has all the standard features of a 3 pin Model 2 with nothing out of the ordinary, except the number. S&W used assembly numbers and FF looks to be what was used on this gun. S&W never stamped both stocks and never stamped the serial number beside the assembly number, since that would be redundant. Someone who did not know how the factory built guns, obviously went over the revolver and added a lot of numbers where the did not belong. It appears that the right stock could have had a serial number near the top where the gouge is. My guess is that the original number was removed, so we will never know what the original number was.