1913-19 Seahorse Issues. 1913 Waterlow £1 Green, mint n.h., very fine and fresh (S.G. £3’750 for mint n.h.). (Image)

1915 De La Rue Seahorses 2s6d imperforate colour trial in yellow-brown in vertical pair, original gum (both stamps hinged), minor gum wrinkles, very fine. (Image)

1915 De La Rue 2s6d Seahorse very pale brown in mint n.h. corner marginal, an attractive example in an unlisted shade, cert. Hendon (2021) which indicates plate wear. (Image)

1915 De La Rue 2s6d yellow-brown mint n.h. block of four from the upper left hand corner of the sheet, variety watermark reversed, light gum bend across the top pair not affecting the very fresh and fine appearance of this rare positional block (S.G. Spec. N64(6)g). (Image)

1915 De La Rue 2s6d very pale sepia brown mint n.h., well positioned, slight gum browning, rare shade (S.G. Spec. N64(2) £2'800). (Image)

1915 De La Rue Seahorses 5s bright carmine mint n.h., very fine and fresh (SG £1'100). (Image)

1915 De La Rue 5s bright carmine mint n.h. with variety "watermark reversed" very fresh and fine, a well centred example of this rare watermark variety (S.G. £6'250). (Image)

1915 De La Rue 10s Seahorse bright (Cambridge) blue, mint n.h., good vibrant colour, slight irregular perfs as often with this issue, fine example of this rare shade (S.G. Spec N70(3), £9'500). (Image)

1918-19 Bradbury Wilkinson 2s6d chocolate brown overprinted "CANCELLED" type 33 in marginal block of four from the right of the sheet, very fresh and well centred, with stamps n.h., cert. Holcombe (1995) (S.G. Spec N65(3)zd). (Image)

1920 5s Rose red (23mm printing) mint n.h. right hand marginal example on simple cypher experimental paper overprinted "CANCELLED" type 24, 23mm high with positional dot, very fine and very scarce. (Image)

1920 Bradbury Wilkinson 5s rose red from the 23mm printing on multi cypher experimental paper overprinted "CANCELLED" type 24, mint n.h. left marginal, very fine and very scarce. (Image)

1920 Bradbury Wilkinson 5s rose red from the 23mm printing on multi cypher experimental paper overprinted "CANCELLED", mint n.h. top marginal clearly displaying the watermark in the sheet margin, very fine and very scarce. (Image)

1929 Seahorse 10s imperf. experimental plate proof with huge margins, with the outer frame line incomplete, printed on thick wove card at the Royal Mint as an experiment into alternative methods of plate production, very fine and rare. (Image)