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E, DanielHow do you know the number was far > than 200 (pre war) for PC ONLY collectors...? Again, not referring to generalized ephemera collectors of which the numbers were large, but those that put together and maintained, and traded for PCs to fill series. And how would they know what cards constituted a full set? There were no checklists that I am aware of for the mass produced postcards, and current lists have been assembled more on what is known to survive than what is known to have been produced.
Just interested (sincerely) in what else you could add, as you hint at more concrete understandings than I am aware of.
Daniel