Was tested with a new battery.
Watch runs very fast. Has not been serviced and needs / should be. Has stopped two times in 3 days of observing it. Blow on the balance and away it goes again.
ESA 9154 Cal. Dynotron Electronic Balance Movement.
1970-75. Gold plated case.
39mm case
18mm lug
40mm lug to lug.
SOLD AS IS. NEEDS SERVICE