The first electric movement to bear the "ESA" name on its plates was the ESA 9150 or "Dynotron". This was a Fixed Coil, Transistor Controlled Balance type movement and appeared in 1968; it was the worlds first movement with a balance that employed a transistor.

The Dynotron range continued through to the mid to late 1970s: ESA 9154 Dynotron appeared in 1970; ESA 9158 Dynotron with date and date appeared in 1975.

Like the Landeron-produced electric movement, you'll not find "ESA" on any dials, but these Dynotron movements were made in their thousands and appeared in many different watches, some of which I own and are listed in the links below. Also like the Landeron, the watch manufacturers often assigned their own calibre numbers to theses ESA movements. On the 9158s, ESA even provided a recess for the watch makers own plate; you can see this in the Hamilton link below: Hamilton Cal. 683 (ESA 9154), Hamilton Cal. 702 (ESA 9158).

• Avia
• Kienzle
• Mondaine
• Hamilton
• Nivada
• Wittnauer

ESA were also very successful in the tuning fork area. They licensed the technology from Bulova in 1968 and production of the ESA 9162 tuning fork movement starts in 1969. It ends in 1976. Many watch companies employed the ESA 9162 including the ones I own below:

• Omega
• Tissot

ESA also modified the 9162 by adding a chronograph plate to the movement; the resultant ESA 9210 is the only chronograph tuning fork watch ever produced; it was only produced in small numbers (21,000) and today it is highly sought after. It was used by Omega (in their Speedsonic range), Certina, Longines and a few other manufactures.