£1500.00

Canada 1930-31 10c olive-green 'Parliamentary Library, Ottawa', right marginal IMPERFORATE horizontal pair, SG299a.

Fresh mint example with large part original gum. Minor gum wrinkle mentioned for accuracy, which does not detract in any way from its supreme quality.

Exceedingly rare with only 50 pairs believed to have existed, and fewer surviving examples.

The Stanley Gibbons catalogue value is £1,800.

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