The rifle has sling studs that was not possibly from the factory?
No factory sling studs although it is nearly impossible to find even a minty post war F without them
It is a post war F made from 55-59 or so. C boss code would make it 1951. Not possible in this case
55 is G
56 is H
57 is I
58 is J
59 is K
Factory D&T