Gruen | Precision Ref. 480 742Gruen, founded in 1894 in Cincinnati, Ohio, was one of the leading American watch manufacturers in the first half of the 20th century. The brand was known for blending Swiss and American watchmaking expertise, with much of its movement production based in Switzerland and final assembly and casing often done in the United States. By the 1940s, Gruens catalog featured models like the Curvex, Veri Thin, and Precision lines, which were celebrated for