cover CANADA: 1910 (17 Dec.) envelope addressed to Manchester, endorsed "Acceleration of the Canadian Pacific Mail Service per "Empress of India'", bearing K.E.VII 4c. and 10c. cancelled by fine strikes of "VANCOUVER/B.C." c.d.s. and showing the security mark "D & CO/LTD" in violet of Dodwell and Co. Ltd.; a very desirable cover. Photo