An awfully cool little pocket slide rule with more scales than you can shake a stick at. This is easily my favorite pocket rule, even though it's all plastic (sorry, Ivorite, ahem.) The metal endpieces give it enough weight to feel like it's not going to float away, and it's surprisingly readable for its size. If the writing on the case is to be believed, it belonged to one D. W. Layton. D. W., if you're reading this, i have your slide rule.