1988 and 1989 Topps Mets/Yankees Double-Headers.
They were those little frames that had the rookie card on one side and the current year side on the other. There are a few 1988's that surfaced on ebay in the past year, I didn't even know they existed until last year.
There are 1989-1990 Double Header sets with all teams that were mass released, the Mets/Yankees ones were released to just a few candy stores in Brooklyn as a test.
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