This recently serviced and all original Seiko 6139-8020 automatic chronograph for sale here was yet another variant of Seiko's famed 6139 line. Seiko placed their movements into multiple highly unique cases, leading to a plethora of out of the ordinary shapes and sizes – not to mention allowing them the ability to stand out on the wrist.
Back in the late 1960's, Heuer and Zenith had taken hold of the entire sports watch industry by racing to become the first to produce an automatic chronograph. It has been widely debated who won, but in the background of this skirmish, Seiko quietly created their own at the same time, beating the Swiss at their own game – the Seiko 6139.
The 6139 was the first chronograph to have a vertical clutch, a feature considered by many to be one of the hallmarks of a superior automatic chronograph movement. The 6139 also features an automatic column wheel timing control, vertical coupling mechanism, and is an integrated chronograph – the first in the world – which means the entire 6139 movement was designed and built to be a chronograph, vice being an automatic movement with a mere timing module added.
With this movement, Seiko set the standard, which was followed by the Swiss watch industries 20 years later. The same movement configuration was adopted by Rolex when it made its own in-house movement for the Daytona in 2000, 30 years after Seiko released the caliber 6139 and 6138.
This 6139 includes a leather strap, NATO strap, springbar tool, and Pelican travel case.
1972 Seiko 6139-8020 Automatic Chronograph
DIAL: Original silver dial with light blue quasi chapter ring, and original minute and hour hands; lume shines. Day/date complication – with rare English/Dutch language variants – at 3 o’clock position works nicely.
CASE: Original 40mm x 42mm stainless steel case; crown is recessed.
CRYSTAL: Original crystal, no scratches.
BAND: This 6139 comes with a light brown leather strap – a great sporty compliment to the inherent vintage nature of this Seiko 6139 chronograph. This 6139 also comes with a dark blue and gray NATO strap, a great compliment to the blue dial.
MOVEMENT: Original Seiko 17-jewel 6139B automatic movement, manufactured in August 1972. This watch received a full service in early December 2019.
CROWN: Original recessed unsigned stainless steel crown.
CHRONOGRAPH PUSHERS: Chronograph pushers depress with a satisfying click, no stick, and reset as designed to zero with no issue.