Chronograph 6139-6000 — Blue Speedtimer Dial, Notch Case

Seiko 6139 family

AutomaticAutomaticA mechanical movement wound by a rotor as the watch moves on the wrist. chronographChronographA watch function for starting, stopping and resetting an elapsed-time measurement independently of the ordinary time display. family with column-wheelColumn wheelA chronograph control system that coordinates the operating levers; a cam system is an alternative construction. control and a vertical clutchA chronograph coupling that engages the driving and chronograph wheels along their shared axis using spring pressure. It helps avoid a jump of the chronograph hand when timing starts.. Specific 6139A or 6139B identity is not inferred from a case reference alone.