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

1879 (December 9), stampless cover, from Plovdiv to Worms, via Constantinople, handstamped “FRANCO” in blue, with blue c.d.s. transit marks (Dec. 23) on front and back, some toning, yet a rare cover, one of only a small number of such examples recorded following the closure of the last Russian field post offices and transfer of civil mail responsibility to Eastern Rumelia, but before adhesive stamps had arrive from Constantinople in late 1880.