1885 (September 20), 1pi black on pale blue, horizontal pair, perforated 13.5, overprint Type I in blue, paying the tied to back of registered cover to Prague by blue circular grid cancel, postmarked Poste Slivno in blue, handstamped RECOMMANDEE, reverse with neatly-struck Osman-Bazar c.d.s. (Sep 23), Prague c.d.s. receiver, a few stains to reverse from prior seals, a rare franking from a provincial town, one of only a small number recorded; signed Thier.
