1872, Paris print 10 b. blue, 15 b. deep brown and 25 b. yellowish bistre (2), tied to envelope from "BACAU 7 JUN 75", endorsed "via Varna", to Athens, paying the full tariff for mail to Greece of 75 bani (the cover was presumably held at the P.O. awaiting full payment, as the 10 b. is cancelled a day after the other three stamps). On reverse transit marks of Bucharest, Galatz, Constantinople and Piraeus. Charged for local delivery with postage due 1875, 40 l. tied by dotted "1". An exceptional and most unusual pre-UPU cover. Certificate Heimbüchler (2012).
