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

1881 (March 27), 20pa black & pale rose, four singles, tied to back of registered cover to Constantinople with blue circular grid cancels, partial blue Yambol despatch c.d.s. on front, handstamped “Recommandee” in blue, reverse with neatly-struck blue Constantinople/Arrivee receiver (Apr 11), some tone spots to envelope and adhesives, one 20pa stamp with portion torn off, cover slightly reduced at right, yet a scarce example of the 2pi registered foreign letter rate.