1897 2½a red surcharge on 3a grey & red strip of three (Types 13-14-14) WITH STOP IN OVPT as distributed to the UPU as specimens. (See footnote after SG 91). VF/UM (couple colour adherences) additionally with variety on the underlying British East Africa OVERPRINT DOUBLE, ONE ALBINO on all stamps, a rare multiple. Photo-cert: Eichele BPB: "As a strip of three of a maximum printing of 730 stamps (number required for UPU distribution) of considerable rarity moreso with the overprint double, one albino." See additional image and of certificate below.