Lot 21, Canada 1851 twelve penny black plate proof, VF July 24, 2020September 15, 2018 by Sparks Auctions Lot 21 Canada #3Pi 1851 12d black Queen Victoria Plate Proof, with Vertical SPECIMEN in Carmine, a left sheet margin single, on card-mounted India paper, with large margins and very fine. Unitrade CV$2,500.