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To verify the year, the receiver cover will have the year stamped on 1949-1954.  The 55-56 models did not have the year stamped on the cover, and instead had a star on the left side of the receiver after the serial number.

Springed pins were original in 1949 and 1950 models with original bolts.  A very few 1951 examples have also been found with the early bolt/carrier system.  All later models were floating pins, and they did not return to the spring.