274th - 283th Corinphila Auction - Day 6

Great Britain Overprinted 1916/23: GB 4 d. slate-green, a used example with variety "NAUP.U" (Row 6, stamp 2) on 1917 registered cover to Chester, readdressed on arrival to Aberdeen, tied by "PLEASANT ISLAND / NAURU" cds (Dec 30) in black. "Pleasant Island / Nauru" registration cachet in violet at left and Chester cds at right (March 9).Reverse with Sydney transit cd (Jan 15, 1918), "Registered / Liverpool" datestamp (March 8) and Aberdeen arrival (March 10). An extraordinary usage of this rare variety on cover.