Great Britain 1876 London to Tunisia via Marseille France Packet Christmas Cover

Folded cover, franked with 4d vermilion (S.G. 152, Plate 15), tied by London "100" duplex (Dec 25), to Tunis, Tunisia, endorsed "via Marseille / per French Packet", "ANGL. AMB. CALAIS F transit c.d.s. on front (26 December), backstamped with Paris, Lyon, Marseille and Tunis (French P.O.) c.d.s. (31 December), light pressed filing fold, a most attractive cover to a scarce destination.