You might want to first check the provenance of the gun. If there is something special
about where it was shipped, or to whom it was shipped, then you'd be miles ahead just
leaving it as it is. A factory letter will give you this informtion.
Assuming there is not special about its provenance, then its just an issue of personal
preference. As Richard points out, refinishing is not free, and it reduces the gun to have
zero percent original finish, which has an impact on its perceived collector value.
This question comes up frequently, and it always boils down to the same thing:
its your gun, and your money.
Mike Priwer