Great Britain 1856 6d green plate proof, SG69var

Great Britain 1856 6d green plate proof, SG69var.

A superb imperforate example on thin white card, neatly cancelled by black Helmsley/Crown experimental circular date stamp for "2.4.56”.

Taken from a prescription album produced for the 1867 Paris exhibition.

A very scarce specialised Queen Victorian stamp.

Stanley Gibbons catalogue value: £7,500.

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