No sure where best to post this, but trying here.
Does anyone know what these are? I bought these off eBay. The guy said he picked them up 30+ years ago from an estate sale in Northern NJ, along with other pieces from the 40s. These are original art on card stock. They’re 5-3/4 by 6-3/4 inches.Three of the backs have a stamp on them (two shown below).
There was also a Batman, Joker, and Wonder Woman, which I didn’t get.
A few backs:
The guy said another bidder reached out and said another p