1914 1d carmine mint block of eight from the lower right corner of the pane showing watermark variety "POSTAGE" inverted on the bottom row and a second "POSTAGE" upright in the sheet margin at foot, only three stamps mounted in the top row, a very rare watermark variety, cert. RPS (2013) (S.G. Spec. R2c). (Image)

1914 2d Postage Due die proof in black on glazed card (68 x 78mm), numbered 123 on reverse, very scarce. (Image)

1915 1s bright blue "Postage Due" horizontal pair of imperforate imprimaturs from the foot of the sheet, mint NH, the reverse with BPMA handstamps; some light gum wrinkling as was prevalent across the whole sheet. Scarce. (Image)

1936-37 1d red imperf. imprimatur block of four from the top of the sheet, mint n.h., the reverse stamped "NPM IMPRIMATUR", very rare with this block containing four of the six examples released from the NPM archive sale. (Image)

1936-37 5d yellow-brown imperf. imprimatur in mint n.h. block of four from the top of the sheet, the reverse stamped "NPM IMPRIMATUR", very rare with this block containing four of the six examples released from the NPM archive sale. (Image)

1955-57 Postage Due 2s6d purple on yellow in mint n.h. upper marginal "arrow" block of four, very fine (S.G. £800+). (Image)

1959-63 1/2d orange on whiter paper imperf. imprimatur pair from the top of the sheet, mint n.h., each with BPMA handstamp on reverse, very fine and scarce. (Image)