Lot 3, Canada 1850s three penny Beaver plate proof, sold for C$374 July 24, 2020November 23, 2018 by Sparks Auctions Lot 3 Canada #1P 1850s 3d Beaver Plate Proof in Red, on India paper, very fine. Rsv. Unitrade $350, sold for C$325.00 plus 15% buyer’s premium.