Many of the Topps sets have this era have stock variations that are ignored. 1966, 1969, 1970, all appear to have white vs. cream versions. White backs are usually easier in the first series and then get progressively tougher or even disappear for a series before coming back again. The 1966 sixth series is the most visually obvious example of the white vs. cream difference. If the 1956 and 1959 white and grey backs are variations as they use clearly different stock, so are these though it seems the hobby only wants to acknowledge ones where the color difference meets some vague arbitrary level beyond being readily visible.
I have a ton of 1970's with the black and white lines too, was picking them up as a complement to my base set for awhile. Not rare, but a fun little expansion to the set. Most of the cards appear to be possible with them, though the lines are not usually present on the uncut material I have seen.
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