There are some incredibly unique collectibles out there, like this 1940/41 O-Pee-Chee double-sided “uncut sheet” I found in a 2005 Mastro auction catalog.
Here’s the lots full description:
In 1940, O-Pee-Chee continued the production of their oversized 5″ x 7″ cards from the year before. The offered uncut sheet contains images of all 50 cards in the 1940 set. Card #’s 101-125 are printed on one side of the sheet while cards #’s 126-150 appear on the other side. Card #’s 101-125 are printed in black and white while the remaining cards are in sepia. A plethora of stars are present, including #’s 102 Sands, 108 Broda, 116 Reardon, 118 Apps, 125 Lach, 130 Broda, 131 Bentley, 132 Schmidt, 136 Patrick and 146 Apps. The sheet measures an imposing 25-1/2″ × 36″. Due to its size, it is host to a plethora of condition problems, including multiple creases, edge tears, surface scrapes, etc. Despite these flaws, we cannot overstate its importance, and the piece may well be the only one of its type in the hobby. With proper framing and matting, this rarity would make a spectacular display piece and nicely complement the finest advanced hockey collection.
However, I think Heritage Auctions got it right when they sold an incredibly similar item in October 2021 for $810 and described it as an advertising poster.
They wrote, “This is a two-sided poster printed on thin paper. Was it meant to hang in retail stores? Did O-Pee-Chee consider making dual-sided cards on paper to accommodate the war effort like ’41 Play Ball baseball cards on paper in the states? Either way, it is very rare. There is some obvious edge damage, surface damage and creasing. Every card is affected by creasing. Overall size is approx 25” x 35″ on paper.”