B64-347. CORRUGATED SOLE JACK PLANE. Sandusky Tool Co. No. 13SC. Part of the line of "semi-steel" bench planes manufactured by Sandusky in the 1920s and based on the 1928 patent of Wilbur Schwer (Sandusky's corporate secretary) for a simplified adjustment mechanism. 14" corrugated sole, 2" proper marked cutter, full intact japanning. These were typically sold with stained maple tote and knob, but these are rosewood and look original with a streak of sapwood in the knob. Possibly a special order. The Schwer patent was a dead end, and these planes are uncommon, particularly in this condition. Condition: Fine, Estimate: 150-300