I have an opportunity to buy what is being presented as a 1902 carbine at a local sporting goods store. The serial number is 355184. The rear sight does not have a "c" stamped on the left side. The cartouche is correct (1902) and the proof test "p" is there behind the trigger guard. What else should I look for to authenticate it before I lay out a grand for it? Thanks for your help.  P.S. It has the lump of protective wood on the hand guard right in front of the rear sight.