STAMPS 
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Links to all Great Britain related material are listed in the left sided navigation bar
Prussian Blue Colour Trials 
The picture shows a set of four imperforate colour trials in the issued design of the 1½d stamp. The future 2½d stamp is in Prussian Blue. Note the date.
Colour Essays 
The scan is part of a set of five imperforate essays in the accepted design submitted to King George for approval. It shows the two colour options, prussian blue (upper) and ultramarine, for the 2½d stamp.
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