1916-23 Waterlow 5s rose-carmine, mint lh bottom sheet marginal single, cert. states toned gum, very fine and rare, cert. BPA (2021) (SG £2'500). (Image)

1916-23 Waterlow 5s rose-carmine, used on fragment tied by "PO PLEASANT ISLAND/NAURU" cds, bottom sheet marginal single, very fresh, fine and rare, cert. BPA (2021) (SG £2'250). (Image)

1916-23 Waterlow 10s indigo-blue, used cancelled by part "PO PLEASANT ISLAND/NAURU" cds, very fresh, fine and a very rare example of this popular stamp, cert. BPA (2003) (Image)

1916-23 Waterlow 10s indigo-blue, used on fragment tied by "PO PLEASANT ISLAND/NAURU" cds, very fresh, fine and a very rare example of this popular stamp, cert. BPA (2008), RPS (1974) (SG £5'000) (Image)

1916-23 De La Rue 2s6d sepia brown, mint nh right marginal single, mounted in the margin only, very fine (SG £600) (Image)

1916-23 De La Rue 2s6d yellow brown, mint nh lower right corner marginal block of four, natural paper speck at lower left, very fine and fresh multiple (SG £280+) (Image)

1916-23 De La Rue 2s6d deep yellow brown, mint left marginal block of four, right vertical pair mint nh, very fine multiple (SG £280+) (Image)

1916-23 De La Rue 2s6d group incl. mint hr yellow-brown (worn plate), mint hr grey-brown, mint lh olive-brown and olive-brown tied to small piece, very fine (4) (SG £330)

1916-23 De La Rue 2s6d yellow-brown, 5s bright carmine and 10 pale blue, used, all neatly tied on registered cover to New York, by "PO PLEASANT ISLAND / NAURU / OC.7.16" first day cancel, plus a few lower values applied alongside, very fine and scarce (Image)

1916-23 De La Rue 2s6d deep brown tied to 1920 (Mar 24) envelope by Pleasant Island cds with matching registration handstamp at top left, sent registered to stamp dealer L'Estrange Ewen, reverse with Sydney, London and Norwood registered ds, minor foxing to envelope, very fine (Image)

1916-23 De La Rue 2s6d brown, tied to 1916 (Oct 7) envelope sent registered to England, also with 1/2d (3), 1d pair and 2 1/2d, all tied by Pleasant Island cds, reverse with Sydney, London, Readnig and Pangbourne ds, some foxing affecting stamps otherwise fine, the EARLIEST RECORDED FRANKING of overprinted GB stamps in Nauru (Image)

1916-23 De La Rue 5s bright carmine, mint nh top right corner sheet marginal block of four, showing part plate position cross, fresh, very fine and a scarce multiple (SG £400+) (Image)

1916-23 De La Rue 5s bright carmine, two mint nh singles and single used on fragment tied by "PO PLEASANT ISLAND/NAURU" cds, fine (SG £350) (Image)

1916-23 De La Rue 5s bright carmine, single neatly tied on registered cover to Bern, Switzerland, by "PO PLEASANT ISLAND/NAURU" cds, fine and scarce (Image)

1916-23 De La Rue 10s pale blue (shade), mint nh bottom right corner sheet marginal block of four, showing small part plate position cross, fresh, very fine and scarce in this quality, cert. BPA (1989) (SG £1'000+) (Image)

1916-23 De La Rue 10s pale blue, mint nh single and used single, fresh and very fine (SG £600) (Image)

1916-23 De La Rue 10s pale blue, mint nh, fresh and very fine (SG £250) (Image)

1916-23 De La Rue 10s pale blue, mint single, showing TRIPLE OVERPRINT, BLACK, RED AND ALBINO variety, short gum crease at upper right, otherwise fine and very rare, ex Keith Buckingham, cert. Brandon (2006) and BPA (2021) (SG £3'750). (Image)

1916-23 De La Rue 10s deep bright blue, mint block of four, fresh, very fine and scarce (SG £2'000+) (Image)

1916-23 De La Rue 10s deep bright blue, single neatly tied on registered cover to Bern, Switzerland, by "PO PLEASANT ISLAND/NAURU" cds, very fine and scarce, cert. RPS (Image)

1916-23 Bradbury 2s6d chocolate-brown, mint nh, bottom left corner sheet marginal block of four, fresh, very fine and scarce (SG £360+) (Image)

1916-23 Bradbury 2s6d chocolate-brown, mint nh, bottom left corner sheet marginal single, fresh, very fine and scarce (SG £90+) (Image)

1916-23 Bradbury 2s6d grey-brown (shade), used, single neatly tied on registered cover to Birmingham, England, by "PO PLEASANT ISLAND/NAURU" cds, very fine and scarce (Image)

1916-23 Bradbury 2s6d chocolate-brown, mint nh top marginal single, showing DOUBLE OVERPRINT, ONE ALBINO, plus showing "MAJOR RE-ENTRY" (Row 1, Stamp 4), gum bends, fresh, very fine and a rare variety and error combination (SG £500+), cert. BPA (1968) (Image)

1916-23 Bradbury 2s6d chocolate-brown, mint, showing DOUBLE OVERPRINT, ONE ALBINO, fresh, very fine and a rare variety (SG £500) (Image)