1955 Wilding 1d ultramarine imperforate top marginal booklet pane of three stamps with printed labels underneath each one, superb mint n.h., with "BPMA" handstamp on reverse, rare. (Image)

1958 2d. light red brown (crisp print) "Dollis Hill Phosphor Trial" very fine perforated block of four on ungummed, unwatermarked Specially prepared handmade paper, without phosphor; rare. (Image)

1959 3d deep violet "Dollis Hill Phosphor Trial", mint n.h. perforated block of six on gummed watermarked paper, with two 3mm blue phosphor bands printed over the ink, very fine and scarce. (Image)

1959 Wildings 3d deep violet "Dollis Hill Phosphor Trial" perforated block of four on gummed crowns wmk (sideways left) paper, with one 4mm blue phosphor left side band printed over the ink, very fine and scarce (S.G. Spec ST7(3)f). (Image)

1963 Freedom from Hunger 2 1/2d and 1/3d imperforate imprimaturs, mint n.h., the reverse showing "NPM IMPRIMATUR" handstamps, very fine and scarce. (Image)

1963 Churchill 4d. and 1s3d imperforate imprimaturs, mint n.h., reverse showing "NPM IMPRIMATUR" handstamps; very fine and scarce. (Image)

1964 20th International Geographical conference set of four imperforate imprimaturs with "NPM IMPRIMATUR" handstamp on reverse, mint n.h., very rare, one of 10 sets released for the NPM archive sales. (Image)

1966 9d Battle of Britain imperforate imprimatur corner marginal traffic light vertical strip of three from the lower right of the sheet, mint n.h., each stamp with BPMA handstamp on reverse, very fine and unique positional item. (Image)

1966 1/3d Battle of Britain, the unique cylinder block of six imperf. imprimaturs from the lower left corner of the sheet, mint n.h., each with "BPMA" handstamp on reverse. Rare. (Image)

1966 British Technology 6d motor cards with red omitted (Minis), mint n.h., very fine example of this very visual and thematic error, offered with a normal example for comparison, very rare, Pierron records only 18 mint examples, cert. BPA (2014) (S.G. £10'000). (Image)

1968 British Anniversaries set of mint n.h. imperforate imprimaturs from the original NPM sales, very rare with only 10 sets released. (Image)

1968 4d Christmas imperforate horizontal pair of imprimaturs, mint n.h., showing variety "Retouched dapples" in position R12/4, each with BPMA handstamp on reverse, superb and unique (S.G. Spec. W142f var). (Image)

1973 European Communities set of three imperf. imprimaturs from the right of the sheet (the 5p in se-tenant pair), mint n.h., each with "BPMA" handstamps on reverse, very fine and scarce. (Image)

1973 British Paintings set of four mint n.h. imperforate imprimaturs from the foot of the sheet, each with "BPMA" handstamp on reverse, very fine and scarce. (Image)

1973 Inigo Jones set of mint n.h. se-tenant pairs with variety phosphor omitted (shows as a white background rather than a cream background), offered with normals for comparison (S.G. Spec. W225/6b). (Image)

1974 Winston Churchill 5 1/2p imperf. imprimatur in mint n.h. traffic light corner block of four, each with "BPMA" handstamp on reverse, very fine and scarce. (Image)

1989 Scots Connection £5 booklet with the third pane completely imperforate, very fine and scarce. (S.G. Spec. XDS3b £1'750 for the pane). (Image)

1989 Scots Connection mint n.h. imperforate booklet pane, scarce. (S.G. Spec. XDS3a £1'750). (Image)

1990 Stamp World London miniature sheet imperforate, mint n.h., post office fresh, very rare as Pierron records only 6 mint examples, a great stamp thematic item featuring the penny black (unpriced by S.G.). (Image)

1998 30p Joyce Grenfell error of value 30 for 37p mint n.h., rare and post office fresh, offered with the normal for comparison (S.G. £1'800). (Image)

2001 Cats and Dogs (Self Adhesive) sheetlet of ten, variety Imperforate, still in its original presentation pack, an incredibly rare variety of which only three are believed to have been found; unpriced in S.G. catalogue. (Image)

2001 Submarines 1st class self-adhesive "Swiftsure" imperforate se-tenant booklet pane with cylinder markings in the selvedge, couple of minor bends, fine and rare, Pierron records only ca.9 mint booklets, only two of which show the cylinders (S.G. £3'000). (Image)