Grail Watch Reference

A Reference Library for Watches from Grail Watch

  • Movement Database
  • Grail Watch Blog
  • Reference Documents
    • 1979 Citizen Movement Table
    • Seiko Blue Book Automatic Movement Chronology
    • Seiko Laurel Brochure
    • Seiko List of Basic and Derivative Calibres
  • About Grail Watch

Connect

  • Email
  • Facebook
  • Instagram
  • Twitter

Powered by Genesis

You are here: Home / Families / ESA Dynotron

ESA Dynotron

Last Update: July 5, 2020

BRANDS: ESA, ETA

Production: 1967 – 
1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s

“Dynotron” was the name used by Ebauches SA for their line of electronic watch movements in the 1960s and 1970s. These were widely produced but eclipsed in accuracy and consumer interest by the tuning fork (Bulova Accutron and ESA Mosaba) and quartz movements that followed. All first- and second-generation ESA Dynotron movements measured 12.5 ligne (28.00 mm) in diameter and had 13 jewels. The third-generation 9157/9158/9159 measure 13 ligne (29.00 mm) in diameter and have seven jewels. They oscillate at 28,800 A/h.

The Dynotron balance oscillator

The original Ebauches SA (ESA) Dynotron movement was Cal. 9150. First produced as early as 1962, the movement was tested and developed for five years before officially entering production in 1967. It has a prominent white plastic balance wheel with wide spokes and large electronic components, including two resistors, a transistor, and a capacitor. It was produced through 1970, when the updated ESA 9154 was introduced. This updated movement has smaller electronic components (notably the capacitor) and a different balance wheel and hacking lever. It was produced through 1975.

There were also unique versions produced for Certina, Derby, and Gruen: The Certina Cal. 9156 features biorythm discs, the Derby/Jaz Cal. 9176 has a rotating mechanical digital display, and the Gruen Cal. 9159 has jumping hours.

ESA 9200

By 1972, Ebauches SA introduced a compact tonneau version for ladies watches. Cal. 9200 measures 7 by 8 ligne (15.3 by 17.8 mm) and is 4.6 mm thick. It has just 7 jewels, despite including a date complication. Like other contemporary ESA electronic movements, it operates at 28,800 A/h. That same year, Ebauches SA re-branded the Dynotron line as Swissonic 10, within the overall Swissonic range of electronic watch movements.

ESA 9150
ESA 9154

ESA 9157

The third-generation ESA 9157 appeared in 1975 and was produced through the end of the decade. It was a total redesign, with most components moved or revised. Notably, the balance is moved 90º and the battery swapped to the opposite side. It has a more modern (and larger) battery, smaller exposed electronics, and a different mechanical/electric hack lever.

Cal. 9150 features hacking seconds (to preserve battery power) and a semi-quickset date, adjusted by moving the hour hand between 23:00 and 24:00.

ESA 9150ESA 9154ESA 9156ESA 9157ESA 9158ESA 9159ESA 9176ESA 9200
Year1967-19701970-197519721975-197?1975-197?1975-197?197?-197?197?-197?
Notable FeaturesDateDateBiorythmDateDay/DateJump HourDigital7×8 tonneau
Date
AviaSwissonic
Certina28.351
28.353
Biostar
Derby/JazSwissonic
Dugena42004204
Girard-Perregaux290
GruenElectronic Jump Hour
Hamilton683
703
702
KienzleSwissonic
Mido1207EO
MondaineElectronic
NivadaElectronic
Tissot430431
Wittnauer
Zodiac9193
Image: The Eastern Jeweller & Watchmaker (Europa Star) 129, 1972

Calibre Start Year End Year Diameter (mm) Diameter (ligne) Height (mm) Complications
ESA 9200 17.8 8 4.6 Date, Day, Hacking Seconds, Quick Date Correction

ESA 9200

Recent Posts

  • A Survey of the Kenissi Movements for Tudor, Chanel, Breitling, and Norqain
  • Bulgari Finissimo: Record-Setting Movements
  • New Movement Family: Zenith Elite
  • Travel Time Trio: ETA’s Calibre 2893
  • Confirming the ETA 2892 Timeline

Links

  • Grail Watch
  • Watch Wiki
  • WatchBase

Popular Movements

  • Seiko 6R35
  • ETA 2893-2
  • Seiko 6L35
  • ETA 2824-2
  • Seiko 4R35
  • ETA 2892-2
  • Seiko 4R57
  • ETA 2892A2
  • Seiko 8R48
  • ETA 2834-2

Popular Families

  • Sellita SW500 Family
  • ETA 2800 Family
  • Seiko 6R Family
  • Venus 175 Family