, bearing 2a. green marginal pair with good margins, clearly cancelled "B/172", showing "PACKET LETTER/MAURITIUS" double-line oval d.s. and, on reverse, "SINGAPORE/P.O." and arrival datestamps, both in red. A most unusual destination. Photo" /> cover 1857 (22 Sept.) entire (light creases) to Cape Town, marked<I> "Via Aden & Point de Galle"</I>, bearing 2a. green marginal pair with good margins, clearly cancelled "B/172", showing "PACKET LETTER/MAURITIUS" double-line oval d.s. and, on reverse, "SINGAPORE/P.O." and arrival datestamps, both in red. A most unusual destination. Photo | Christie's