Ottoman Bulgaria: 1874 (April). Folded complete commercial entire to Istanbul franked with irregular perf. 1pi and 20pa brown border postage due type of 1870 Dulos stamps for 1 1/2 piastres single weight up to 100 route hours rate tied by ÇIRPAN [now Chirpan] (vilayet Rumeli-i Şarki, A&P type 1, RR) double circle handstamps and oval merchant cachet.
