[Footballdude]

That makes sense. From what I've seen, even the price guide people have never given much consideration to football variations. Not that I would be too concerned about the values, but I think things like this are at least worth mentioning, especially in any kind of comprehensive reference book.

I have also noticed similar differences in 1968 Topps (white and tan backs), as well as 1967 (white/tan backs plus the Milton Bradley "mustard yellow" printed backs.)