7101-138 H.P. BROOKS patented knife sharpener. Patented April 28,1874 (150,225), and according to the patent, his improvement was to "facilitate the holding and the adjustment of the bar, to allow for changing position of the bar to the knife, and to support the knife and press it against the cutting-edge with more or less leverage, at the same time keeping the cutting-edge from contact with the support." Some wear to the frame, file looks ok, surface rust spots on both. This looks like an earlier model without the glass cutter. Uncommon. Good 40-80 (PLH947A)