1970 Seiko Chronograph (Ref. 6139-6020) "Pulsations"

In the 1960s and 1970s, Seiko produced a variety of affordable mechanical chronograph watches. This particular one is unofficially known as the 'Doctor's Watch', or the Seiko "Pulsations", which is a chronograph designed for doctors to measure resting heart rate with its inner rotating 'Base 10' numeric system bezel. Not only can the Pulsations be used to measure resting heart rate, but this watch would also make for a great output timer for a number of engineering or measurement needs. 

The "Pulsations" happens to share the same 6139 movement as the famed Seiko "Pogue", which was the first automatic chronograph that was available for purchase in May of 1969 exclusively to the Japanese market. This striking watch has a deep chocolate brown dial which contrasts handsomely with the bright red chronograph hand, red sub-seconds hand, and day wheel font.

Stock # SKO61396020
Brand Seiko
Style Chronograph
Model 6139-6020
Serial 021XXX
Size Men's
Material SS
Dial Brown
Millimeters 40
Bracelet 2pc Handmade Leather Strap



This attractive square cushion case shows honest use and appears to have been lightly polished in the past, but retains full and even lugs. All original caseback engravings remain clear and visible. The black and silver inner "Base 10 Pulsations" bezel is in stunning condition with all markings fully intact. The case retains its original crown and pushers. Comes with a 2pc handmade leather strap. 


The attractive chocolate brown dial is in excellent vintage condition with no signs of age. All lume plots are bright white and fully intact when inspected under U.V. light, showing no signs of age. The original cigarette-style hands have aged a shade darker than the dial, under U.V. light inspection the minute hand show minor lume loss, the hour hand remains fully intact. The red sub-dial sweep-seconds hand and chronograph hand contrast the dial perfectly and are in excellent condition. Both matching chocolate brown day and date wheels are in excellent condition. All sliver indices, day window, and date window are in excellent condition, showing very minimal signs of age. 


None. Watch is functioning and keeping time, previous service history is unknown.

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