The St. Regis Universal Atomizer No. 100 with Box is a vintage dental tool originating from the United States. This atomizer, along with other dental tools included in the listing, is a collectible item from the field of medicine and dentistry, specifically designed for medical purposes. The St. Regis Universal Atomizer No. 100 is a piece of history that showcases the evolution of medical devices in the early to mid-20th century, offering a glimpse into the advancements made in the field during that time.