Sets, SPECIMEN, Mono-colours, Die I, Die II
½d, compound perf. 14 x 15, green. Block of four, upper right stamp with natural inclusion and area of browning on reverse. Fine from front, unmounted. A GREAT ADMIRAL RARITY AND CONSIDERED UNIQUE. B.P.A. certificate (2001) 'toned, is genuine'. SG 208a
Note: very few unused examples of this compound perforation are known, and it may well be that this block accounts for around half of that number. This is the ultimate way to collect a compound perforation, with both perforation types intersecting within the block. Of the other two known unused examples (both ex. Gibbs), neither can be described as without fault