Search for Mego and Gig Magna Heroes here:

Mego Corporation
Research and Design Prototype Sample

US Card Magna-Heroes Incredible Hulk

Originally manufactured by Mego and sold oversees by Gig in Italy in their packaging, Mego apparently slabbed a few of these on US blister cards under the Mego brand and shopped them around
at Toy Fair with a poor response resulting in these production samples being moth balled by corporate executives.  This example is the only known US Carded Hulk figure at present.  Likewise,
there are one each of the other three figures in the series (Superman, Batman, Spiderman) that have been found on US cards and are in a separate private collection. I believe these 4 were literally the only ones produced for that show, and none after.  This was obtained by me from a Mego Design and Engineering executive who had it since putting it together decades ago.

For more information on the Magna Heroes Hulk and the other figures in this line visit the Mego Museum here: Mego Museum Magna Heroes