The Pickett & Eckel Inc. All Metal Slide Rule N1010-ES Trig is a high-quality engineering tool manufactured in the United States. This vintage slide rule, dating back to the 1959, is still in its original case and has not been modified. It is a prized collectible for enthusiasts of science, medicine, and engineering, showcasing the craftsmanship and precision of its time. The Pickett & Eckel slide rule is a functional piece that embodies the history and legacy of American mathematical instruments.