1952 Wildings 2 1/2d Carmine-red (wmk Tudor Crown, type I) imperforate imprimatur in lower marginal horizontal pair with central sheet ornament, mint n.h. with "BPMA" handstamps on reverse, very fine and scarce. (Image)

1956 Wildings 1 1/2d green mint nh, imperforate imprimatur pair from the foot of the sheet ex delivery coils, the reverse with "BPMA" handstamp, 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)

1959 Wildings 3d deep violet "Dollis Hill Phosphor Trial" perforated pair on gummed crowns wmk (upright) paper, with one 4mm blue phosphor band printed over the ink between the two stamps, very fine and scarce (S.G. Spec ST7(3)b). (Image)

1963 Red Cross 3d mint n.h. left marginal pair with red cross almost completely omitted on left stamp and mostly omitted on right stamp, very fine, cert. BPA (2015) (S.G. £12'000 for single with completely omitted red). (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)

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)

1965 Churchill 4d & 1s3d (phosphor paper) set of two imperforate imprimaturs, each stamp with a "BPMA" handstamp on reverse, in mint n.h. left marginal singles, very scarce. (Image)

1966 British Birds (phosphor) mint n.h. se-tenant block of four with variety bistre omitted affecting all four stamps, top right corner marginal, offered with a normal for comparison, very rare so fine, especially without the usual gum toning (S.G. £6'000+). (Image)

1966 Battle of Hastings 1s3d mint n.h. lower left marginal cylinder block of 8 showing progressive gold omitted (Queen's head) with two complete omissions and two partial omissions in the left column, with the cylinder number for gold still present, very fine and rare (Note: Although not listed by S.G. due to the possibility of the gold being removed chemically, the fact that this block shows a progression of the omission proves that this is a genuine error). (Image)

1966 Battle of Hastings (phosphor) mint n.h. with lilac omitted variety, very fine, incl. normal for comparison (S.G. £950). (Image)

1968 British Bridges set of four imperforate imprimaturs from the right of the sheet, mint n.h., each with "BPMA" handstamp on reverse, very fine and scarce. (Image)

1968 British Paintings 1s9d with embossing omitted in mint n.h. lower left corner marginal cylinder block of six, very fine and scarce positional item (SG £840+). (Image)

1969 Christmas 1s6d with variety DEEP SLATE OMITTED (face value and detailing) in mint lower left corner marginal cylinder vertical strip of three, incl. matching normal for comparison, a very fine and attractive positional item (SG £1'575+). (Image)

1971 "Ulster 71" Paintings set of three imperf. imprimaturs from the right of the sheet, mint n.h., with BPMA handstamps on reverse, very fine and scarce. (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 Explorers 5p with variety black-grey omitted (Sir Francis Drake’s jacket), mint n.h. right marginal, very fine and scarce (Pierron records only 24 mint examples), incl. normal for comparison, cert. Brandon (1997) (SG £2'250) (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 Paintings 5p with GREENISH YELLOW OMITTED variety, mint n.h., very fine and scarce, Pierron records only 30 mint examples of this modern error, incl. normal for comparison (SG £1'200). (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)

1978 9p Christmas mint n.h. marginal block of eight from the foot of the sheet with the lower block of four showing variety imperforate, very rare with only 15 mint pairs recorded. (Image)

1984 Urban Renewal 31p mint n.h. imperforate horizontal pair, very fine and very rare variety, Pierron records only 5 mint pairs (SG £3'500). (Image)

1984 Christmas 17p mint n.h. left marginal imperforate lower left corner cylinder block of six, very fine and unique cylinder block, Pierron records 10-15 mint pairs (SG £9'000+). (Image)

1984 Christmas 17p IMPERFORATE mint n.h. right marginal pair, very fine and rare, with only 10-15 mint pairs recorded (SG £3'000). (Image)