ETA / Valjoux 7750

Last updated: July 27, 2025

Brand

ETA, Valjoux

Caliber Number

7750

Production Period

1973 – Present

Lignes

13.25”’

Diameter

30.0 mm

Height

7.9 mm

Power Reserve

Unconfirmed

Frequency

28,800 A/h (4 Hz) (early models were 21,600 A/h)

Jewels

17 (early models), 25 (modern)

Escapement

Swiss Lever

Anti-Shock Device

Incabloc

Hand Count

6 (Hour, Minute, Small Second, Chronograph Second, 30-min counter, 12-hour counter)

Manufacture Region

Unconfirmed

Functions

Chronograph (12-hour, 30-minute, 60-second), Day, Date, Small Seconds

ETA / Valjoux 7750 Description

The ETA/Valjoux 7750 is a highly successful and widely used Swiss automatic chronograph movement. Initially developed by Valjoux in the early 1970s, its production was halted by the quartz crisis but revived in the 1980s after Valjoux’s integration into ETA. It uses a cam and lever system (coulisse) for its chronograph functions, making it robust, reliable, and suitable for mass production. It is famous for its “wobble” caused by the unidirectional winding rotor and is considered a “workhorse” of the watch industry.