1992 Marvel Masterpieces Prototype 3 Card Set
Sealed in Cellophane packet

Wolverine Hulk Spider-Man

These three cards are stamped "PROTOTYPE" in blue on the back.

They were originally issued with all three in a cellophane package.
They are quite rare, especially if still in cellophane, and more scarce than the promo cards of the same issue.

The third and fourth pictures show the cards not in cellophane for reference (not part of auction)
but this auction is for the sealed packet of 3 prototypes.