Steinway & Sons Mahogany Grand Piano Consign Now DeptCollections, FurnitureSize70 in. x 58 in. Steinway & Sons Mahogany Grand Piano, Patent Grand Construction October 3, 1899, serial #122313, the Overstrung Scale Pat. December 20, 1859 and May 28, 1872 New York 70 in. x 58 in. Please note that this auction has ended. Click here for an overview of this auction.