used 1877 (Mar.) Montreal printings, perf. 11½x12 15c. lilac-grey showing small portion of "Alexr. Pirie & Sons" paper maker's watermark, fresh and extremely lightly cancelled, centred slightly to upper right lower right corner perf. creases and with a few slightly blunt perfs., otherwise fine. Rare. S.G. 75ab, £2500. Photo