Opinions vary widely on refinishing vintage firearms but given the
facts that your gun has already been refinished over pitting and is
import marked there is no collector value. The only problem I would
see in having it reblued would be putting money in it that would not
be returned at time of sale. If it's pitted it would require heavy buffing
to get down to a smooth finish which would probably remove all
marking. I think it might be best enjoyed as is and future money
invested elsewhere. Post a pic if you can.