1970 - 1973 Goldplated Roamer Searock Electronic ETA 9154/MST 619

Mysteron

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1970 - 1973 Goldplated Roamer Searock Electronic MST 916 , MOD 916.2210.333

I found another Roamer, and this one is an abomination of a transistorized flywheel with discrete electronic components. Certainly the strangest one I saw yet.

1970 - 1973 Goldplated Roamer Searock Electronic MST 916 , MOD 916.2210.333

ETA-ESA 9154 Dynotron


1970 - 1973 Goldplated Roamer Searock Electronic MST 916 , MOD 916.2210.333 rear cover

Below is a summary of the data I found online:
From the very early 1970s, Roamer first started advertising the Dynotron powered watches, including the 606 that appeared in catalogs between 1970 and 1973.

This watch features a Roamer MST 916 (which is really a ETA-ESA 9154 Dynotron), 20-micron gold plated,

battery 344

Roamer MST 916 (a ETA-ESA 9154 Dynotron) transistorised electric balance wheel. This watch along with the gold version is the most elusive of the electronic Roamers to find. Unlike the others of the series like the 606 and Searocks, they also do not appear in any catalogues.


ETA-ESA 9154 Dynotron / MST916 ?
Swiss, 13 Jewels; Incabloc
Features
electronically controlled balance motor
sweep second
date: set by changing 23-24h
hack feature
 

John Arrowood

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The ESA 9154 movement was widely used in several name branded wrist watches: Elgin, Waltham, Bulova Caravelle and Sears Tradition. Swissonic appears on some of the dials. I have 5 of them and all but one are keeping pretty good time.
 
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Mysteron

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Mar 13, 2022
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The ESA 9154 movement was widely used in several name branded wrist watches: Elgin, Waltham, Bulova Caravelle and Sears Tradition. Swissonic appears on some of the dials. I have 5 of them and all but one are keeping pretty good time.
I have opened about 3 "electronic" watches today, so I am over the system shock, I wasn't expecting to find so many, But it seems a logical step in developing quartz watches.
 

John Arrowood

NAWCC Member
NAWCC Gold Member
Dec 14, 2001
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I checked out the ESA movement on the Ranfft site and it was also used by Certina, Dugena, Girard-Perregaux, Hamilton, Tissot, and Zodiac. Looks like it was used as widely then as the ETA 2824-2 automatic is today.
 

Mysteron

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I saw several iterations of this movement on google images, you can see the capacitors, etc change with the times... I used to be into vintage electronics. I would say this one is on the older side of the spectrum.

I'll get a battery soon and see if it runs.
 

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