Rhodesia 1970-73 2c ultramarine Postage Due, lower marginal block of ten (5x2) being the bottom two rows of a sheet showing plate number '1B', imprint and '20756' sheet number, error printed on the gummed side, SGD19a.
A very fine unmounted mint positional piece with full original gum.
A rare and unusual error, particularly in this form.
The Stanley Gibbons catalogue value is £500+.
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