1888 envelope to Sir Henry Barkly, London, the ex Governor of Mauritius, the backflap with the blue insignia of the Government House, Seychelles, franked with a pair of Mauritius16c cancelled by barred B64 cancellers with a SEYCHELLES 10 AP 88 datestamp alongside. A London AP 27 88 arrival c.d.s. is on the back. A fine and scarce double rate cover. 2014 B.P.A. Certificate.