68's have at least four different stocks, not all of which exist in each series. In addition to the differences in the yellowy tone of the back, the white areas show signs of multiple stocks as well, some of which are much brighter than the creamier ones.
I don't know what was happening in 68. The 2 series football issue that year has a white back and, I think 4 different versions of a cream back, all of which occur in both it's series.
By 1969, Topps back is just a couple stocks again, like normal.
I have a hard time telling the backs apart in scans that are less than perfect with my crappy eyes, so I haven't tried to do the set in each stock.
In hand, genuine MB's are very different from the lighter/yellower stocks of the Topps issue, the lightest of which was not used during the first 2 series anyways.
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