Thanks, the SN indicates 1909 manufacture, so you are right on. Will the two piece tang show signs of peening if I shoot this gun a few thousand rounds? I have test fired it with 2 1/2 in RST lites and it is a delight as far as POI regulation and the F and F chokes. I do not know how to measure chamber length but assumed it to be 2 5/8 chanber. What say you?