Stamps and Covers of the World - Day 1

GIBRALTAR. 1879 (Dec 5). Cover to ´HMS Alaska´ in Panama, franked by Great Britain 1875 2½d. rosy mauve pl. 16 tied by Gibraltar /A26 duplex. Framed red ´Returned / Deficient Postage´ and franked (over-paid?) by Great Britain 1s. green pl. 13 tied by heavy obliterator cancel in black applied in London. Red London transit (Dec 12) and British P.O. ´Panama´ arrival cds (Jan 23, 1880) in black. A rare and most unusual cover. SG Z26,Z64.