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I guess what I'm trying to figure out is how rare true F-VF and VF stamps from that era are
They are neither rare nor difficult to find. Keep in mind that Scott prices stamps at VF. Even XF stamps are not difficult to find, even at catalog price or below.
It's the "Superb" grade stamps that are "relatively" hard to find, or should I say, difficult to find at a low price for Scott #~300-500.
Also, keep in mind that some stamps are notorious for having poorly centered stock. The Kansas-Nebraska overprints are an example. A complete set of VF+ MNH is not as easily achieved as one might think, and it's not unusual to see them retail/sell at or above Scott catalog.