Auction 309-320 - Great Britain 1840–1841 Europe & Overseas - Day 5

Russo-Turkish War 1878: Cover carried free of charges from Sistov to Tirnovo, with rare bilingual (Russian at top, Bulgarian at base) "SISTOV P.K. - SISTOV POST OFFICE 1" cds (April 9) in blue-green (Tchilinghirian unrecorded type) "Sistovskaya P.K. - Svishtovska Poshtenska-Kontara 1", whilst unrecorded by Tchilinghirian this type is known in use at Gabrovo and Tirnovo, this example shows the date-slugs awry and inverted. The Russian Military Post Offices remained open until transferred to the new Bulgarian Postal Administration on 1/13 May 1879. An extremely rare cover.