Gary Maguire sent us these photos of his box of crackers. Naturally he's unwilling to spoil it by opening it (although he says he's very tempted), but examining the back panel we believe there would have been two identical transfer sheets — each the one shown.
The style of the sheet very strongly suggests the Shreddies Superman II transfers (LP143), so I expect it uses the same artwork, repurposed.
Picture Credit: The SPLAT Scan Archives — Gary Maguire
© Tom Vinelott 2020