Auction 333-341 Nigeria, Cameroon, Sudan & Worldwide Postal History - Day 4

1915: C.E.F. surcharge on the Marks values, 1s., 2s. (both with top sheet margin), 3s., and 5s., all nicely used. The postmarks are "DUALA 15.1.16 KAMERUN" for all except the 5s. stamp, which is from "23.7.15". Signed and accompanied by a certificate from Pascal Scheller, which notes a slight alteration on the 5s. stamp (barely noticeable), 1 s. to 3 s. also signed A. Brun. SG £ 4000.