E T, I agree that it's been 'lightly' rearsenal'd, possibly in late 1950 or later because of the metal's finish. The N. American manufacturers jumped into 2-groove barrels quite early on and yours must've been in good enough condition to not have needed replacement. The backsight may've been a damaged Mk.I or a Mk.II, both of which would have been replaced. The cocking piece likely was originally the button style, but required replacement.

I'd leave it as is.

Brad
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