A Dietzgen No. 1765P 10-inch Basik Trig Type Slide Rule which is Made in Germany. It comes complete with Instruction Manual, an imitation leather sheath and the original box. The rule measures 11 ¾ inches by approx. 1 ½ inches wide and is in very good used condition. The sheath shows wear, a few tears and is missing a piece at the top. The box shows wear and has the original label on one end and the flap has been torn on the other. The instruction manual has been in the box for an extended period of time so it is formed and folded to fit.