The Seiko 6139 automatic chronograph – a historical movement in its own right, like this near new-old stock Japanese Domestic Market (JDM)-only 1972 Seiko 6139-7060 here – 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.
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 near NOS emerald 6139 comes with a leather rally strap, nylon NATO strap, Pelican travel case, and springbar tool.
Near NOS 1972 Seiko 6139-7060 SpeedTimer Automatic Chronograph
DIAL: Brilliant emerald blue SpeedTimer-signed dial in perfect, with correct minute, hour, and chronograph hands. Day/date – with Japanese Kanji/English language variants – at 3 o’clock position works nicely, and the inner tachymeter ring rotates smoothly as designed. Lume plots shine following exposure to strong light.
CASE: Extremely sharp stainless-steel case measures 41mm x 44mm stainless steel case - no scratches. Case lines are fully razor sharp, with no evidence of machine polishing. Brush finish remains full intact on case top and underneath, and contrasts spectacularly with polished case sides - a design seen on many vintage Seiko of the era. Matching waterresist caseback, which retains its blue protection sticker.
CRYSTAL: 6139-correct hardlex crystal, no scratches.
BAND: This 6139 emerald blue comes with a brown leather rally strap, as well as a dark blue, white, and green nylon NATO strap.
MOVEMENT: Seiko 6139B automatic movement, manufactured in November 1972.
CROWN: Recessed original unsigned stainless-steel crown.
CHRONOGRAPH PUSHERS: Chronograph pushers depress with satisfying click – no sticking. With a firm push, original chronograph main and subdial hands reset to zero.