The Seiko 6139 automatic chronograph – a historical movement in its own right, like this early 1970 Seiko 6139-6000 "Cevert" proof/proof here, w/Uncle Seiko presidential bracelet – was one of the first automatic chronographs created and ranks with Zenith’s El Primero and Heuer’s Calibre 11.
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.
Those who know vintage Seiko - in particular 6139 chronograph's - know these early 6139 proof/proof's come up for sale rarely.
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 features a single register chronograph allowing time to be measured in increments of 30 minutes, and 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 an Uncle Seiko stainless-steel bracelet, nylon NATO strap, springbar tool, and Pelican travel case.
1970 Seiko 6139-6000 "Cevert" Proof/Proof Automatic Chronograph
DIAL: Dark blue proof-signed dial. Hands include the correct two-piece large red chronograph seconds sweep hand seen on these early Ceverts. Day/date complication – with Roman/English variants – at 3 o’clock position works as designed.
CASE: Stainless-steel case measures 41mm x 43.5mm, with sharp caselines, with notch above recessed crown; matching caseback. Inner tachmeyer, with slight fade, rotates smoothly as designed.
CRYSTAL: New Seiko 6139-correct Hardlex crystal, no scratches or blemishes.
BAND: This 6139 comes with a high quality Uncle Seiko "presidential" stainless-steel bracelet, with tight links that will fit up to an approx. 8.5 inch wrist. This Cevert also comes with a dark blye and red nylon NATO strap, with stainless-steel hardware.
MOVEMENT: 17-jewel non-JDM Seiko 6139A automatic movement, manufactured in February 1970.
CROWN: Recessed and unsigned stainless steel crown.
CHRONOGRAPH PUSHERS: Chronograph pushers depress with a satisfying click and resets designed to zero with no issue.