I have a 308 that's in 98% original condition that my dad bought used for me in 1968. Serial# 3950 which makes it a 1955 model. I have the checkered stock but what's odd is that there is no cloverleaf. Is it possible that the previous owner sent it back to the factory for stock replacement due to damage or breakage and the cloverleaf insert was replaced with the newer style when the stock was replaced?