Heinrich Köhler 384 Auction – Day 1 Single Lots: Europe and Colonies, Kingdom of Lombardy–Venetia – The "P.G." Collection

1880 (19 October), 20pa violet on green and 2pi black & yellow-brown 1876 issues of Turkey, tied to registered cover to Plovdiv by blue Constantinople c.d.s., manuscript notation on reverse “destinatair inconnu” and handstamped on front with blue RETOUR, reduced at left and opened at bottom, some tone spots, yet an uncommon registered & returned to sender cover to Eastern Rumelia.