You need to look at each part, there will often be a Fxx about 3mm ~1/8inch high on it somewhere. For the receiver underneath the RHS could well be a F49 or similar to say when it was made. The trigger guard for one should be stamped, front sight protector, bolt body, top of magazine follower, oh and on the barrel. PF307xxxx well, from my notes - "PF 304048 to PF 309347 N/Known" So the more info you can provide the more we'll know what happened to them or who got those. Made in 51 or 52 probably.

Pictures help a lot. It shouldnt be shiny if so it has been refinished.
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