Tanganyika Mafia Island 1915 3a Handstamp Double, Rarity

Mafia Island: 1915 British Occupation KGV IEF 3a orange, dull blue handstamp, variety HANDSTAMP DOUBLE (SG M38var). Superb UM example with well separated strong impressions of the handstamp. An exceedingly rare variety. Photo-cert: Eichele BPP. See additional image and of certificate.