The Movement

The ESA 9162/9164 movements are often considered the “Rolls Royce” of tuning fork movements. They were designed by Max Hetzel, who had previously worked for Bulova; he was also responsible for the Accutron 214.  In May 1972, ESA also released a chronograph version of these tuning fork movements; it was known as the ESA 9210 and was used in the Omega Speedsonic range of watches.

The Omega watches employing these tuning fork movements were usually referred to as the ‘Omega f300’ models reflecting the frequency of the tuning fork. The non-chronograph f300s must have been produced in the tens of thousands and are often seen on a popular auction site today.

Omega, like many other watch makers, allocated their own calibre numbers to these movements:

• Omega Calibre 1250 = ESA 9162 (date only)
• Omega Calibre 1255 = ESA 9210 (chronograph day and date)
• Omega Calibre 1260 = ESA 9164 (day and date)

The Omega version of these movements differ slightly from standard ESA 9162, 9164 and 9210 movements in having copper plated plates throughout the movement; all other watch manufacturers kept the ESA-supplied nickel plated plates, however all the parts, including the plates, are fully inter-changeable.

note: above text from electric-watches.co.uk

Link to Accutron page with the long read 

Full service by Robert Berkavicius july 23’

Rob wrote july 18 2023

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Hi Jesper,

The Omega is finished now and running as it should. The main problem was that the tuning fork was vibrating with too much amplitude, causing the index system to double index at as low as 1.65v. Normally they should phase up to 1.85 volts before they do that, which it does now with the new fork. This is quite an unusual problem which I don’t see very often. Also, I changed the day ring as it’s teeth were quite chipped. Even though it may have been working, it would be bound to fail before too long. This damage is caused by setting the calendar between the hours of 9pm to 1am when the normal mechanism is working, something which should be avoided. Overall, the watch is in really good condition, nice to see!

Omega f300 s/s silver dial dial s/n  35672053

Service/repair charge      $140.00
Gasket set                 $6.00
Tuning Fork                $55.00
Day ring                   $49.00
Battery                    $ n/c
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Total                  USD $250.00

Return shipping            $12.00
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TOTAL                  USD $262.00

My Paypal ID is fotoplot@iinet.net.au

Paypal.me link: https://www.paypal.me/AccutronWatchPage

Thanks,
Regards, Rob