This a cheaper version of The Durham razors. The Durham Safety Razor Co. was founded in New York,N.Y.c1908 by Thomas C. Durham. The first Durham Duplex U.S. Patent was filed in October 1906 and then in January and March 1907. By 1920 Durham-Duplex claimed eight million users. after many mergers a successor company Durham Duplex in Sheffield England still operates selling blades and knives with retractable blades.The Durham Demonstrator was a popularly used safety razor and hair trimmer of the first half of the 20th century before the use of electric razors.A Durham Demonstrator. This is a hair thinning and trimming resembling a straight razor which folds back into the handle. The handle is black plastic/ composite. It still contains the blade which is double edged. it has a built-in open comb safety guard.On handle: "To Be Used With/ Durham-Duplex Blades" on one side and "Durham Demonstrator" on the other. The blade is marked "Pat'd U.S.A. May, 28 07"razor durham-demonstrator grooming hair-trimmer