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You want overkill? Think of the fairly recent U.S. "Flag on Porch" issue -- the different varieties number somewhere in the 20s as I recall.
68, according to the very good Adminware-website. And that is excluding PNC's.
I think it's fun to collect these. All the varieties are not really intended, so it is not at all like the zillions of stamps coming from Guyana, Grenada, Tanzania etc.