This is a timely conversation for me, as I am in the process of putting together a 1968 set.
Some unscientific observations from my experience thus far (I now have 501 of the 598 total):
1) the two brick and mortar stores I frequent have albums with older vintage cards by year for sale. In each location, supplies of the 6th series generally were close to non-existent.
2) the major e-bay and Beckett stores I use normally use (Burbank, Mantlerulz, Batters box) show a similar lack of 6th series cards as well.
3) Where I can find them elsewhere, some patterns emerge:
- A number of the cards in rows 6 and 7 on the pictured slit do seem to command premiums - the May, Denehy, Cline, Wagner in particular. Others don't seem to, but of course it's always possible some sellers don't realize they may be in shorter supply.
4) A few cards that aren't on these "SP" rows also command premiums well above and beyond, most notably John Tsitouris which is a real hard one.
An image of the other slit would be great to come by.
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