B68-734 CORRUGATED SOLE SMOOTHING PLANE. Tower & Lyon No. 1255. Based on Chaplin's first 1872 patent and manufactured by Tower & Lyon. Original cutter marked with the dates both for the Chaplin's patent and Tower's 1876 patent for the cast iron tote, but the design is actually Johnson & Torkelson's 1888 patent with the adjustable throat. See PTAMPIA I, Fig. 192. 9" corrugated sole, 2" cutter. Light rust on cutter and some pitting on tote, 70% nickel loss on lever cap, light wear to knob, otherwise very clean. The throat adjustment was awkward to use and expensive to make; only a small number of the Chaplin patent planes include this feature. From the collection of Harold Unruh. Good+ 200-400