Vintage Pickett N902-ES Simplex Trig Slide Rule with slip case and manual

Vintage (circa late 1960's) N902-ES Simplex Trig slide rule. Finish: Yellow aluminum with crisp black markings. Very good pre-owned condition. Fully functional. Includes original vinyl case and original "How to Use Trig Slide Rules" book. Some wear on tear appropriate for age. Please see photos. Stored safely in a trunk for decades - clean, dry, and well preserved. Smoke free home. Unable to bundle. Whether you are a STEM enthusiast, vintage tech collector, or simply drawn to the tactile charm of pre-digital tools, this slide rule is a conversation starter and a piece of history. Perfect for display, gifting, or adding to a retro workspace. Rare find.