I reckon that there are probably fewer than ten folks that have the vast majority of tabbed Zeenuts from the 1933-1936 timeframe. I further imagine that at least one or two of them has a fairly robust checklist based upon year of issue. But most of those folks are the series "completists" who are working on the 3,500+ series and for them the delineation is not as important. The variations in the 1933-1936 series are generally widely known (and indicated in the Horne book), and it's mostly from there a question of finding tabbed examples where they exist to get the specific year.
As far as I know, not all of the variations from the 1933-1936 timeframe are known to exist with a tab. Obviously some of the more notable ones are, like Joe D
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