It all depends on the depth of the pits. If it is just light surface freckling then it can be removed abrasively being careful not to erase markings or round over corners. Deeper pits require TIG welding and surface grinding back down to the surrounding original surface, again being extremely cautious not to remove markings or destroy original contours. What George said is right on - probably best left to a professional and if not severe, let it alone. I do not consider scattered pinprick pitting to be severe.
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If it's made after 1918...it's a reproduction
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