Nauru 1916-23 10s indigo-blue "Seahorses", SG18Nauru 1916 23 10s indigo blue "Seahorses", Waterlow printing, right marginal block of 4 from R7 8 3 4 on the sheet, with abnormal 'SPECIMEN' overprint (type GB26), SG18. A brilliant unmounted mint marginal block of four with full original gum. A magnificent piece, perfectly centred and wonderfully fresh. Keith Buckingham's book (p. 24) notes that only six examples with this overprint (previously unknown and not recorded by Samuel) were released by the
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