Generally, I think post 1960, the 77 card series are where true SP's reside and they don't seem to follow a set pattern. So these are all possibilities with 77 counts (but some may not be true 77 card impressions):
1961: 5th & 6th
1962: 5th, 6th & 7th
1963: 5th (solved)
1964: 5th & 6th
1965: 5th, 6th & 7th
1966: 5th, 6th & 7th
1967: 6th & 7th
1968: 6th
1969: 6th & 7th
I think there may not really be SP's in 1968 or 1969, more like Over Prints, which I'm sure is true for some of the above in the years prior as well.
Last edited by toppcat; 06-15-2020 at 07:59 AM.
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