Gibraltar: 1886 21/2d. overprinted “SPECIMEN”, with lightly toned gum, fine. S.G. 4a. R.P.S. certificate (2010). Photo. (Image1)

Gibraltar: 1886-87 21/2d. cut down die proof in black on white glazed card, fine. Photo. (Image1)

Gibraltar: 1889 25c. corner plate pair variety broken “N” in “CENTIMOS” unmounted mint and marginal block of four with the same variety, fine.

Gibraltar: 1889 25c. marginal pair variety small “I” in “CENTIMOS”, and marginal block of four variety small “I” in “CENTIMOS” and “5” with short foot, mint, the latter unmounted.

Gibraltar: 1889 25c. block of eighteen, unmounted mint, incl. broken “N” in “CENTIMOS”, some creasing, otherwise fine. S.G. 18, a, b, cat. £890. Photo. (Image1)

Gibraltar: 1889-96 5c. to 5p. set (less 1p. bistre and ultramarine) in horizontal pairs overprinted “SPECIMEN”, with gum, a few minor imperfections, otherwise fine. S.G. 22s-33s. Photo. (Image1)

Gibraltar: 1889-96 20c. olive green and brown variety watermark inverted, fine used. S.G. 24w, cat. £900. Photo. (Image1)

Gibraltar: 1889-96 1p. imperf. colour trial in bistre and mauve, without gum, fine. Photo. (Image1)

Gibraltar: 1898 4d. variety “FOUR PENCE” trimmed at top, small part original gum, creasing, otherwise fine. S.G. 43a, cat. £700. Photo. (Image1)

Gibraltar: 1903 Watermark Crown CA 1/2d. to £1 set, all overprinted “SPECIMEN”, mainly fine with gum. S.G. 46-55s, cat. £550. Photo. (Image1)

Gibraltar: 1904-08 Watermark Mult. Crown CA 21/2d. corner plate block of thirty, unmounted mint, incl. variety large “2” in “1/2”, fine. S.G. 59, a, cat. £650. Photo. (Image1)

Gibraltar: 1904-08 Watermark Mult. Crown CA 21/2d. variety watermark large “2” in “1/2”, good used. S.G. 59a, cat. £1,100. Photo. (Image1)

Gibraltar: 1904-08 Watermark Mult. Crown CA 4s. corner example with plate number 1, fine unmounted mint. S.G. 63, cat. £170. Photo. (Image1)

Gibraltar: 1904-08 Watermark Mult. Crown CA £1 corner example with plate no. 1, fine mint. S.G. 64, cat. £650. Photo. (Image1)

Gibraltar: 1906-11 Watermark Mult. Crown CA 1d. to 8s. set overprinted “SPECIMEN”, fine with gum. S.G. 67-74s, cat. £600. Photo. (Image1)

Gibraltar: 1906-11 Watermark Mult. Crown CA 6d. dull and bright purple used on 1913 (Mar. 10) registered cover to Brunswick, Germany. Photo. (Image1)

Gibraltar: 1912-24 Watermark Mult. Crown CA to £1 (less 1/2d. and 1d. but with both 1s.) and 1921-27 values to 4s. all overprinted “SPECIMEN”, mainly fine with gum. Photo. (Image1)

Gibraltar: 1912-24 Watermark Mult. Crown CA 1/2d. to £1 set mint, mainly fine. S.G. 76-85, cat. £325. Photo. (Image1)

Gibraltar: 1912-24 4s. imperf. plate proof in black and carmine, block of four from the left of the sheet with plate no., with gum, lower pair with creasing, otherwise fine. Photo. (Image1)

Gibraltar: 1912-24 4s. corner plate block of four, mint, two stamps with crease, traces of toning on gum, otherwise fine. S.G. 83, cat. £152. Photo. (Image1)

Gibraltar: 1912-24 8s. imperf. plate proof in dull purple and green, block of four with plate no. 1, with gum, minor creasing, otherwise fine. Photo. (Image1)

Gibraltar: 1912-24 Watermark Mult. Crown CA £1 corner plate block of four, mint, three stamps unmounted, one stamp with minor gum wrinkles, otherwise fine. S.G. 85, cat. £560. Photo. (Image1)

Gibraltar: 1919 low value key plate die proof, plate 2, with “AFTER/STRIKING”, initialled and dated “12.9.19. Photo. (Image1)

Gibraltar: 1921-27 Watermark Mult. Script CA 1/2d. to 8s. set overprinted “SPECIMEN”, with gum, slightly varied condition. S.G. 89s-101s, cat. £600. Photo. (Image1)

Gibraltar: 1921-27 Watermark Mult. Script CA 11/2d. variety watermark inverted, fine used. R.P.S. certificate (2006). S.G. 91w, cat. £1,300. Two copies known. Photo. (Image1)