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What you should do is get it inspected for authenticity, and if it really is a valuable mistake like it seems to be, then lock it up somewhere and try to keep it in great condition. And the next time one of them die, sell it. Or just wait till they both die. An artists music is worth more right when they die.

Sounds like an amazing find.

Get that appraised! And enjoy the turntable, I just got into records like a couple years back. It's such an awesome thing analogue sound is coming back.