when things get slow I pull out a plastic tub or shoebox of covers and look for anything unusual...heres an interesting cover with stamps you do not see that often !
I am wondering if all first day covers of #2150a or #2150b ("Zip + 4") might have required the presence of #2150 (or some other regular stamp), since the "Zip + 4" required a precancel permit to use.
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