[AustinMike]

John, I've uploaded a picture of the 1956 Yankees Action Photo set. These are all 8 by 10 inches. As you can see, they have names printed on them with some appearing to be facsimile autos. So yours could potentially be from "Action Photo" sets for the Cardinals and Dodgers. I only collect Yankee photo sets so I don't know what is out there for other teams.

I've also attached a photo with the 1956 and 1958 team photo set Mantles attached. These are 6 by 8-1/2 inches. As you can see, these differ from the Jay photos quite a bit.