remove action and barrel from stock, which you should anyway as old guns tend to rust under the wood. There are letter codes on the lower left side of barrel that I have a table for. My guess is 1949. there were 69,000+ made from 1940-1945 under govt. contract. About 150,000 made total till 66 (Remington officially says 137,000 but admits it may not be accurate. I think it is a special order 513T with Lyman sight and checkering up grades. I have increased my valuation to $600, at least, if I am correct.