Semi - Postal issues. 1919, ''Posta Ceskoslovenska'', black diagonal overprint on Hungarian due stamp of 5f green and black, watermark Double Cross, vertical pre- printing paper fold, still full OG, previously hinged, VF appearance, several experts hs on reverse (sign of Leseticky seems questionable, however the stamp is guaranteed genuine in all respects), S. Sismondo certificate, C.v. $1,325 (Image)