Great Britain 1840 1d black plate 4, the cancellation removal trial of 1840, SG2 British Guiana stamps 000 sets printed

000 sets printed

Canada 1851 (June 14) 12d black on vertically laid paper

upper marginal block of 4

Great Britain 1918 2s6d chocolate brown

Great Britain 1840 1d black plate 4, the cancellation removal trial of 1840, SG2 British Guiana stamps 000 sets printedGreat Britain 1840 1d black plate 4, the cancellation removal trial of 1840, SG2 As early as January 1840 the treasury was advised that the red handstruck "PAID" markings could be removed from covers by the application of creosote oil. As a result of this alarming fact the treasury instructed experiments to be undertaken on the ink used for cancelling postage labels. The Penny Black was so well printed in such fast colours that it was a fairly simple