Card front
This blog already profiled a very similar issue, the "regular" 1977 Hostess baseball set, but that entry doesn't tell the whole story. The 150-card set does share the same checklist and basic design, but single-card panels like Munson were both collectible and packaging.
In the 70s, one- or two-pack Twinkies sat on a paper card, probably to prevent damage during the packaging process. (Today, they just come in a plastic sleeve, with no extra "support.") Three-packs, on the other hand, came in boxes, as shown in this ad. The staining on both sides of Thurman probably means he supported a two-pack of Twinkies.
Local printers and packagers made the boxes and cards fit their own equipment, so players vary somewhat in size, text, and layout. Check out this "Twinkie Variations" Net54 discussion for several examples.
Baseball guides colloquially call them the "Twinkie" set, since that was the primary vehicle for this kind of card, but it's possible other products came wrapped this way. (As the above ad implies, Hostess made lots of different snack cakes.) Look for the black bars on each card back, as they distinguish a "Twinkie" from the regular 3-card-panel set found on boxes.
Card back
Fakes / reprints: Haven't seen any reprints in the market. I'm pretty confident this is real, given the cake stains.


