Gruen | Curvex Ref. 370-597Gruen, founded in 1894 in Cincinnati, Ohio, was one of the largest and most influential American watch manufacturers through the first half of the 20th century. The company became especially renowned for its innovative case and movement designs, blending Swiss and American watchmaking expertise. In 1935, Gruen introduced the Curvex a revolutionary wristwatch that featured a curved case and, crucially, a curved movement designed to follow the contour