CANADA 1868-90 Large Queen 15c brown-purple pair (UNUSED), SG71aCanada 1868 90 Large Queen 15c, IMPERFORATE HORIZONTAL PAIR in brown purple, upper marginal with trace of imprint, SG71a. A fine quality pair with original gum and rich colour and especially large margins. A real stunner. Only 200 pairs existed and are rare in this form and quality. Accompanied with a Vincent Graves Greene Philatelic Research Foundation certificate of authenticity (1991) as Scott 29d for block of 4, from which this is the upper pair.