This vintage Pickett Slide Rule N-515-T is a true gem for collectors and enthusiasts alike. Made in the United States, this slide rule is a perfect addition to any collection of engineering and science memorabilia. The red leather case included in the package adds an extra layer of elegance and convenience. The slide rule is perfect for those who appreciate the beauty and functionality of vintage technology. It is a great conversation starter and a unique piece of history. The Cleveland Institute of Electronics has done an excellent job of preserving this slide rule, making it a great addition to any collection.