This Keuffel & Esser 4088-3 slide ruler is a high-quality tool that was manufactured in the United States. It comes with a durable leather case to protect it from scratches and damage. The ruler is perfect for anyone in the engineering or science fields and is a great addition to any collection of vintage tools. The ruler is easy to use and has accurate measurements, making it highly functional for a variety of projects. The craftsmanship of this slide ruler is exceptional and is a testament to the quality of manufacturing in the United States.