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MVSNYCa card without an advertisement printed on its reverse, is considered a "blank back", period. they come in different forms (proofs, handcut, factory cut, etc), but they are ALL considered blank backs, which command a premium, with printer's proofs commanding a huge premium. printer's proofs were created (front printing only) before mass producing the cards. they allowed the printers to allign the various colors, and make a final mock-up or sample...
"normal" blank backs (whether they were factory cut or hand cut), never received the tobacco ad printing on the reverse, and were most likely pulled and not put into packs for distrobution.