The John Wilks British East Africa: 1898 U.P.U. Specimen Overprints (with stop after "Africa"), produced in late 1897 to satisfy U.P.U. requirements, 1/2a. to 5a. and the three surcharge types of the 21/2 on 1a., with gum (the type 12 21/2 on 1a. showing almost complete offset of black overprint), chiefly fine. (8) Photo. (Image1)

The John Wilks British East Africa: 1898 U.P.U. Specimen Overprints (with stop after "Africa"), produced in late 1897 to satisfy U.P.U. requirements, 1a. indigo and red with red overprint, albino overprint and double offset of both overprints in black on reverse, large part original gum. Ex Baillie. Very scarce with only two recorded examples. Photo. (Image1)

The John Wilks British East Africa: 1898 U.P.U. Specimen Overprints (with stop after "Africa"), produced in late 1897 to satisfy U.P.U. requirements, 21/2 on 3a. grey and red, rare horizontal strip of three with surcharge types se-tenant (Minns B-A-C), mint, type 12 a little heavily mounted but type 14 very lightly hinged and type 13 unmounted, fine. Ex Minns and Krieger. S.G. 89-91. Photo. (Image1)

The John Wilks British East Africa: 1898 U.P.U. Specimen Overprints (with stop after "Africa"), produced in late 1897 to satisfy U.P.U. requirements, 21/2 on 3a. grey and red showing type 14 variety "2" over "1" in fraction, mint, fine. Ex Hind, Danson, Pennycuick, Minns and Vestey. Rare, occurring only once per pane and it is probable that a maximum of thirteen examples were created, five now in private hands (one in the Royal Philatelic Collection). Illustrated in "British East Africa: The Stamps and Postal Stationery" by Minns (ed. Krieger, 2006), p. 109. Photo. (Image1)