If the serial numbers all match, and the third digit in the sequence is L, then it is a Long Branch (such as 41L1234)
Thread Long Branch - Linking Serial Numbers to Month of Production will tell you the month of production
If the stock is either birch or maple, then it is probably an original stock. Some early models were in walnut, but the Canadianicon stock of walnut ran out early in production, and walnut was reserved strictly for snipers.