Vintage Gruen 335-558 Black Zephyr Men\。Vintage Gruen 335-558 Zephyr Men\'s Mechanical Wristwatch 335 Swiss 10k GF Product Description Item: Wristwatch Brand: Gruen Model: Veri Thin Driver Reference: 335-558 Movement: Mechanical Case Material: 10k GF Country: Swiss Gender: Men\'s Caliber: 335 Size: 23.5mm Product Measurements Diameter: 23.5mm Width: FALSEmm Lug Width: 16.5mm Lug to Lug: 31.5mm Thickness: 8.5 mm Product Condition Overall Condition: Fair, overall condition for its age. Functions: Running, but may be in need of service. This means, it can run unreliably, start or stop and timekeeping is not guaranteed. Case: There are scratches on the case. Crystal: There are scratches on the crystal. Dial: The dial has scratches and discoloration. Hands: The hands have rust on them. Band: The band is not original. About the brand: Founded in Ohio - Gruen was one of the largest American watch manufacturers for the greater part of the 20th century. In fact, shortly after their relocation to Cincinnati, Gruen became the number one selling watch brand in the US. Like many brands - their factory in Time Hill ceased production of wristwatches and produced contracted military watches for the US Military in WW2. After the war, the flood of Swiss import watches had a disastrous effect on Gruen, and the brand ultimately closed its doors in 1977. Today, their wonderful line of vintage watches such as the Airflight, and Curvex models are all that remains of this once great brand.