I found the original listing from July 1984 issue of Current Card Prices where the high number SP's and DP's were introduced (sort of). This was to be based upon my researching one of the uncut sheet slits at the time. The publisher had his own thoughts based upon his dealer experience also the thought a differently arrayed slit might be out there based upon his (extensive) inventory, which eventually turned out to be right of course.
We never addressed the 66 high number SP's; first I can find that happening is in 1989 issues of Baseball Cards magazine.
Enjoy the trip down Memory Lane!
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