Great Britain 1840 paper and gum trial, SGDP3a.
A very fine example produced by Perkins Bacon for the forthcoming 1d black and 2d blue adhesives. Endorsed in manuscript "og" (ordinary gum), "16lbs" (Weight per ream) and "Ca Po Mg" (Chemicals added, Calcium, Potassium and Magnesium).
A very fine example of these rare trials with full gum on reverse.
A fascinating piece of history from the pre-dawn of the adhesive postage stamp reflecting the experimental work undertaken in preparation for the world's first adhesive postage stamp.
Accompanied with a 2007 British Philatelic Association (BPA) Certificate of Authenticity.
SG Catalogue Value: £5,000.
