1915 (May) 6c violet overprint on small fragment, very fine and scarce (Image)

1915 (May) 6c violet overprint on envelope addressed to Zanzibar, ZANZIBAR JY 9 15 arrival cds alongside, very fine and extremely rare, one of only THREE known commercial covers

Expertise: Cert. RPS (1979) (Image)

1915 (May) 6c violet overprint on envelope addressed to Zanzibar, MAFIA JA 23 1915 (several months before issue so perhaps incorrect date?) cds alongside, a few stains and non-commercial, fine and rare

Expertise: Cert. BPA (1986) (Image)

1915 (May) 6c on 2 1/2h brown, overprinted in black, mint, very fine and rare (SG £2'500)

Expertise: Cert. Brandon (2004) (Image)

1915 (May) 6c on 2 1/2h brown, overprinted in bluish green, used single tied on small fragment by part FPO cds, very fine and rare (SG £2'500)

Expertise: Cert. BPA (1971) & (1995) (Image)

1915 (May) 6c on 2 1/2h brown, overprinted in violet, used single tied on small fragment by part FPO cds, very fine and rare (SG £2'500)

Expertise: Cert. BPA (1948) & (1995) (Image)

1915 (May) 6c on 2 1/2h brown, overprinted in violet, unused, showing SURCHARGE DOUBLE, very fine and an extremely rare unlisted error (SG £2'500 )

Provenance: Marquess of Bute

Expertise: Cert. Holcombe, Brandon (2004) (Image)

1915 (May) 6c on 2 1/2h brown, overprinted in bluish green, used single tied on small fragment by part FPO cds, showing SURCHARGE INVERTED, very fine and an extremely rare unlisted error (SG £2'500 )

Expertise: Cert. BPA (1948), Brandon (2004) (Image)

1915 (May) 6c on 4h green, overprinted in violet, mint bottom sheet marginal block of four, with lower pair unmounted mint, very fine and an extremely rare multiple (SG £11'000 )

Expertise: Cert. BPA (1955) & Brandon (2006) (Image)

1915 (May) 6c on 4h green, overprinted in black, mint single, short corner perf., very fine and rare (SG £2'750)

Expertise: Cert. Brandon (2004) (Image)

1915 (May) 6c on 4h green, overprinted in black, mint single, showing DOUBLE SURCHARGE, very fine and an extremely rare error (SG £2'750 )

Expertise: Cert. Brandon (2004) (Image)

1915 (May) 6c on 4h green, overprinted in bluish green, tied on small fragment, showing INVERTED SURCHARGE, very fine and an extremely rare error (SG £2'750 )

Expertise: Cert. Brandon (2004) (Image)

1915 (May) 6c on 4h green, overprinted in violet, mint se-tenant vertical pair with dull violet "G.R.Mafia" and "G.R.Post 6 cents Mafia", the top stamp with the type 1 overprint and the lower stamp with the type 2 surcharge, top stamp lightly hinged and bottom stamp unmounted mint, vertical gum crease at right.

Very fine and an extremely rare variety, exhibition showpiece

Provenance: Colonel J.R. Danson

Expertise: Cert. BPA (1955) & Brandon (2006) (Image)

1915 (May) 6c on 7 1/2h carmine, overprinted in violet, mint single, very fine & rare (SG £2'500)

Expertise: Cert. BPA (1955) & Brandon (2004) (Image)

1915 (May) 6c on 7 1/2h carmine, overprinted in violet, mint bottom sheet marginal single, very fine & rare (SG £2'500)

Expertise: Cert. BPA (1999) (Image)

1915 (May) 6c on 7 1/2h carmine, overprinted in black, used single, very fine & rare (SG £2'500)

Expertise: Cert. RPS (1970), Holcombe (1995), Brandon (2004) (Image)

1915 (May) 6c on 7 1/2h carmine, mint single, showing both "G.R.Mafia" overprint and "G.R.Post 6 cents Mafia" surcharge on the same stamp, very fine and an extremely rare error (SG £2'500 )

Expertise: Cert. Brandon (2004) (Image)

1915 (May) 6c on 7 1/2h carmine, mint single, showing both "G.R.Mafia" overprint and "G.R.Post 6 cents Mafia" surcharge on the same stamp, very fine and an extremely rare error (SG £2'500 )

Expertise: Cert. RPS (1981), Brandon (2004) (Image)

1915 (May) 6c on 7 1/2h carmine, mint single, showing both "G.R.Mafia" overprint and "G.R.Post 6 cents Mafia" surcharge on the same stamp, very fine and an extremely rare error (SG £2'500 )

Expertise: Cert. Holcombe (1991), Brandon (2006) (Image)

1915 (May) 6c on 15h ultramarine, overprinted in black, mint single, very fine and rare (SG £2'250)

Provenance: Colonel J.R. Danson

Expertise: Cert. Brandon (2004) (Image)

1915 (May) 6c on 15h ultramarine, overprinted in black, mint single, showing surcharge applied at an angle, very fine and rare (SG £2'250 )

Expertise: Cert. Brandon (2006) (Image)

1915 (May) 6c on 15h ultramarine, overprinted in bluish green, used single, cancelled by part FPO cds, showing INVERTED SURCHARGE, very fine and rare (SG £3'500 )

Provenance: Colonel J.R. Danson

Expertise: Cert. Holcombe (1991) & Brandon (2004) (Image)

1915 (May) 6c on 15h ultramarine, overprinted in black, used single, tied on small fragment by part FPO cds, very fine and rare (SG £2'500)

Expertise: Cert. Holcombe (1994) & Brandon (2004) (Image)

1915 (May) 6c on 15h ultramarine, overprinted in black, mint bottom sheet marginal vertical pair, showing DOUBLE SURCHARGE, very fine and a rare error (SG £4'500 )

Expertise: Cert. BPA (1959) (Image)

1915 (May) 6c on 15h ultramarine, overprinted in black, mint single, showing surcharge applied sideways reading up, very fine and a rare error (SG £2'250 )

Expertise: Cert. Holcombe (1989) & Brandon (2004) (Image)