This vintage 1950s/60s Hamilton Illinois Mechanical Watch is a classic timepiece with a solid caseback and a two-piece strap band. Made in the United States, this round wristwatch features a manual mechanical movement and a buckle closure. With a stylish dress/formal design, this men's watch has a 31mm case size and a lug width of 16mm, making it a timeless accessory for adult watch enthusiasts. The watch runs well and is a unique piece of history from the Hamilton brand.  Runs well and has service marks.  Not sure of timing of service.  Manual wind.