This guy was produced by the Government Printing Office in 1942. Nothing fancy here. It gets right down to business! At 12 inches, it's one of the largest wheels we have. As you can see, it offers all kinds of valuable information for identifying tanks and their capabilities. It's double-sided, but the side I'm not showing here is missing it's inner wheel. Plus that side has swastikas.
While this thing is pretty sturdy, I really can't see soldiers in the field fumbling with a wheel this big. Maybe it was a study aid. I don't imagine the guys fighting in Europe would need to identify Japanese tanks (which are on the reverse side). The pictures are interesting, aren't they?
Click on each picture to see a larger version.