Great Britain 1951 2d pale red brown (Watermark Sideways) imprimaturs, SG506var.
Superb unmounted mint, with full original gum, horizontal strip of three imperforate imprimaturs with “NPM IMPRIMATUR" handstamp on reverse.
A very rare King George VI strip of imprimaturs in uncirculated condition from the first approved printing sheet.
Provenance: Ex. National Postal Museum (NPM) Archive sales.
Stanley Gibbons catalogue value: £5,500 for a pair.
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