Do you have problems with your images? I would just close my eyes and not look for the scratch if you don't. It cannot be fixed or re-polished by Hasselblad. Also, the older C type lenses are running out of spare parts. I wouldn't take the chance. If you saw the condition of the glass on the commercial Ektars I used in the early 1980's at a catalog studio, you would have been horrified. The chromes looked fantastic...