in red ink, red oval-framed "PD" overstruck by London Paid d.s. (21.7) and Calais entry c.d.s. A neat and attractive three colour franking illustrating the 10c. per ½oz. pre-UPU rate to France. S.G. 73, 77, 86. Photo" /> cover 1c. orange-yellow (2), 2c. deep green and 6c. yellow-brown, all tied by Montreal duplexes on 1874 (10 July) envelope to Paris, showing manuscript<I> "3"</I> in red ink, red oval-framed "PD" overstruck by London Paid d.s. (21.7) and Calais entry c.d.s. A neat and attractive three colour franking illustrating the 10c. per ½oz. pre-UPU rate to France. S.G. 73, 77, 86. Photo | Christie's