TU1 Tudor Hydronaut. Reference 20020. Watch measures 41mm and is made from steel. Automatic movement base caliber ETA. Sapphire crystal on the front and a closed case back. Waterproof 15ATM or 150 meters. Functions are hours, minutes, sweep seconds and date. Rotating bezel for diving. This watch is fitted with the original steel bracelet with integrated folding clasp. Naturally this watch is complete with the original box and papers dated August 2014. Please be aware that this watch has just been completely polished and checked by our watchmaker and is in mint condition. Great every day watch!