Ottoman Turkey – Bulgaria: 1870 (4 August). Folded complete entire to Tirnova (today Veliko Tarnovo) franked with 20pa imperforate and 1pi of 1869-71 irregular perf. Dulos stamps for 1 1/2pi single weight up to 100 route hours rate (distance was 91 hours) tied by DERLAIYYE 81 triple box handstamps and Stamboul dispatch cds on reverse. Any Dulos stamps with error or major variety on postal documents considered a rarity. Isfila 70DE11
