Great Britain 1915 2s6d very deep brown "Seahorses" (Watermark Inverted), SG405var.
A very fine unused, with original gum, right hand marginal pair of this rare colour shade and watermark variety, lightly mounted on one stamp only.
A very scarce piece from Britain's most successful stamp issue.
GB Specialised Catalogue No: N64(11)f.
Stanley Gibbons catalogue value: £7,000+.
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