[Cozumeleno]

Nice sheet of W513s - I actually had that same sheet until recently except mine was a little (okay, a lot) worse around the edges. Your thought of them simply using whatever they had available for a few runs makes sense. And what I forgot to mention is that I've actually seen them on a third type that is as thick as the thicker ones but on stock that is even lighter.

I just have a hard time believing they were faked with none of the really big names in that set. I thought they could be part of a poster but the back is like a grainier cardboard type that doesn't match other posters from that era.