Manufactured: 1896 to 1943 Length: 10 inches Blade Width: 7/8 inches Construction: Cast iron, beech handle & knob Finish: Nickel plated Features: Additional side extensions (comes with 1 set) Uses: Cuts 1 inch to 5 inch semicircles Average Dealer Price: $300 to $600 Average eBay...Continue Reading... Stanley No. 57 Core Box Plane