The Vintage Pickett Model N1010-T Trig Trigonometry Slide Rule is a collectible piece from the United States with a classic design that showcases its functionality and durability. This slide rule, made by Pickett, is a valuable tool for mathematical calculations and is a piece of engineering history. The addition of the leather case adds a touch of elegance and protection, making it a practical and stylish item for any collector or enthusiast of vintage tools. Excellent condition.