I found a mismatched

drum and was wondering what the other members of the board think about the effect on the price. The back, rotor and key are New York 5th generation. The cover is Bridgeport. The back and cover are both 85-90%, but with a couple small areas of surface pitting. The cover may have been refinished, though I can't tell for sure.
I have not had the opportunity to fire it to see how it runs, so I can't comment on that. The mismatch obviously affects it value, but how much considering that the majority (and working part) of the drum are NY 5th gen?
Any input would be appreciated.