Canada Official Stamps 1950-52 20c slate, type O5 'G' overprint, upper right corner plate 'No. 2' block of 4, SGO187.
A fine quality block of four, unmounted mint with full original gum. Hinged in top margin, and lower left stamp with unobtrusive surface adhesion.
A scarce positional piece and rarely seen so fine.
The Stanley Gibbons catalogue value is £240+.
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