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Ha. Prob bootleggers mistake or they were testing the prints. Awesome though! Has some novelty value for sure. But I dont see many cross over Dirty Dancing / Metallica fans. Need someone funky to pull that one off.
I once had a Bowie/Whitesnake front/back misprint.
Jimmy J
(Please note: Legit checks I do in this forum should not be considered 100% conclusive; I'm simply giving a gut reaction based on the limited information provided.)