This vintage Jeppesen Flight Computer Model CR-5 circular slide rule comes with a leather sleeve, making it a great addition to any aviation collection. The rule was made in the United States and is part of the Circular Slide Rule collection. The brand, Jeppesen, is well-known in the aviation industry for producing high-quality products. This flight computer is no exception, with its sleek design and convenient accessory leather sleeve. It would make a unique and valuable gift for any aviation enthusiast or collector.