Royal Jewelers offers this certified preowned vintage Seiko “Helmut” Chronograph model 6139-7100 in excellent condition. The stainless steel case is 41mm in diameter. Black dial with index hours and luminous hands indicating hours, minutes, chronograph seconds with 30 minute counter and windows for day and date. Self-winding Seiko caliber 6139. Black rubber strap. The movement has been serviced while the case was not polished.