, bearing ½a. pale blue Die I pair (close to large margins) tied by "B/172" obliterators and showing red arrival c.d.s. on reverse. Photo" /> cover 1857 envelope (creases etc.) addressed to Lunatic Asylum, Calcutta, marked<I> "Per Shannon"</I>, bearing ½a. pale blue Die I pair (close to large margins) tied by "B/172" obliterators and showing red arrival c.d.s. on reverse. Photo | Christie's