B66-375 SALESMAN'S SAMPLE. Tyrod. D.C. Filatreault patented the "Backbone" hammer on December 9, 1924, which consists of a hammer with a steel rod which passes through the length of the handle, which is dovetailed the entire length (see The Improved Hammer, page 31). This is presumably a salesman's sample with the bottom half of the hammer missing to reveal the rod and end screw, as well as a cutout in the head. 50% label on handle, mild wear and oxidation. Examples of the "Backbone" hammers are uncommon, so this sample is genuinely rare. From the collection of David Jeffers. Good+ 150-300