The Seiko 6139 automatic chronograph – a historical movement in its own right, like this 1973 Seiko 6139-6005 "Cevert" here, w/high quality Uncle Seiko H-link bracelet – was one of the first automatic chronographs created and ranks with Zenith’s El Primero and Heuer’s Calibre 11.
Back in the 1970’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 awidely debated who won, but in the background of the skirmish Seiko quietly created their own, beating the Swiss at their own game – the 6139.
Fast forward to late 2018, and Seiko enthusiasts were treated to the discovery early 1970s famous Formula One racing bad boy Francois Cevert wore one while racing, hence the moniker "Cevert," which caught on in collector circles quickly.
The 6139 was the first chronograph to have a vertical clutch, a feature considered to be one of the hallmarks of a superior automatic chronograph movement. The 6139 features an automatic column wheel timing control and an integrated chronograph, which means the entire movement was designed and built to be a chronograph, vice being an automatic movement with a mere timing module. The 6139 movement features a single register chronograph allowing time to be measured in increments of 30 minutes.
This Cevert comes with a solid Uncle Seiko H-link bracelet, nylon NATO strap, Pelican travel case, and springbar tool.
1973 Seiko 6139-6005 "Cevert" Automatic Chronograph
DIAL: Dark blue Seiko-signed dial, with matching minute, hour and vibrant red chronograph hands. Day/date - with English/Spanish day variants - at 3 o’clock position works nicely. Inner tachymeter ring rotates smoothly as designed. Lume plots are in pearly white condition, with slight uniform patina and correct sugar cube texture, and shine following exposure to strong light.
CASE: 41mm (w/o crown, 42mm with) x 46mm stainless steel case with "water 70 resist" signed caseback. Red and blue “Pepsi” bezel insert remains intace with little wear, and case lines remain sharp with no evidence of machine polishing. Brushed finish on top of the case remains.
CRYSTAL: Hardlex crystal, no scratches or imperfections.
BAND: This Cevert comes with a quality stainless-steel Uncle Seiko H-link bracelet, which will fit up to an approx. 8.5" bracelet. It also comes with a dark blue and red nylon ZULU strap.
MOVEMENT: Seiko 17-jewel 6139B automatic movement, manufactured in November 1973.
CROWN: Recessed unsigned stainless-steel crown.
CHRONOGRAPH PUSHERS: Chronograph pushers depress with satisfying click – no sticking. Red chronograph main and subdial hands reset as designed to zero.