Transvaal 1905 KEVII 1d Error Watermark Cabled Anchor

1905 KEVII 1d scarlet WATERMARK CABLED ANCHOR (SG 274b). Superb Used example of this interesting error printed on paper intended for the Cape of Good Hope issue. Cancellation (Johannesburg?) perfectly dated 13 MR 06 in centre (close to earliest recorded use presently stated as 3 MR 06). Scarce. (cv£325). Photo-cert: BPA. See additional images and of certificate below.