Great Britain 1870 1½d rose red Plate 3 imprimatur, SG51

Great Britain 1870 1½d rose red Plate 3 imprimatur, SG51.

A superb unused right hand marginal imperforate imprimatur lettered 'BL'.

Very rare, one of only 23 possible examples many of which are in institutional collections.

Plate 3 was registered on 13 April 1874 and put to press on 10 August 1874.

These imprimaturs represent the first sheet printed of a stamp issue from the approved and finished printing plate, the equivalent to the first edition of the stamp issue.

Provenance: Ex. "Verus".

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