, bearing 1½c. on ½a. blue pen-cancelled pair additionally tied by Penang "D14" duplex and showing, on reverse, Calcutta arrival d.s.; some ink etching and other lesser faults. A great rarity, being one of only three recorded covers bearing the 1½c. on ½a. adhesive. Photo" /> cover 1868 (5 Mar.) entire letter from Mauritius to Calcutta via Penang, marked<I> "p Madras"</I>, bearing 1½c. on ½a. blue pen-cancelled pair additionally tied by Penang "D14" duplex and showing, on reverse, Calcutta arrival d.s.; some ink etching and other lesser faults. A great rarity, being one of only three recorded covers bearing the 1½c. on ½a. adhesive. Photo | Christie's