Great Britain 1840 1d black (VR official), SGV1var.
Very fine and fresh unused imperforate imprimatur lettered NL from the second registration sheet (Before hardening). Very scarce, one of only 33 possible examples, many of which are included within institutional collections.
Accompanied with a Royal Philatelic Society (RPS) 2010 certificate of authenticity.
Great Britain 1881 3d rose, plate 12 (Watermark Crown). Very fine unused original gum top marginal imperforate imprimatur lettered AB. Very rare being one of only 17 possible examples, many of which are in institutional collections. SG158var.
Great Britain 1956 2½d Carmine-red 'Wildings' (Watermark St Edwards Crown Sideways). Superb unmounted original gum bottom marginal imperforate imprimatur pair, each stamp with a BPMA handstamp on reverse and showing sheet number '26511' in margin. Ex sideways delivery coils. Scarce. SG544var
Great Britain 1934-35 ½d Green (Harrison printing, Watermark block cypher). Superb unmounted original gum imperforate imprimatur top marginal tête-bêche pair of booklet panes of six imprimaturs with British Postal and Museums Archive handstamps on reverse. Some gum wrinkling prevalent throughout the sheets nevertheless very scarce. SG418var