http://www.invaluable.co.uk/auction-lot/1893-type-4-d-in-blue-on-2-d-purple-on-blue,-m-1228-c-f91423baac1893 (Type 4) ½d in blue on 2½d purple on blue, M (trace of a crease at right - not affecting fine appearance), SG.14, Cat. £425.
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