ETA / Valjoux 7750

Last updated: July 27, 2025
Mechanical watch movement with gears, jewels, and engraved text CAL. 7750 25 JEWELS on metal surface—showcasing the renowned ETA Valjoux 7750 caliber.

Brand

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.

Watches Using The ETA / Valjoux 7750 Caliber

Vintage Nivada Grenchen Chronomaster Aviator Sea Diver 105-9870 watch with black leather strap and silver case.
A vintage Nivada Grenchen Chronomaster Aviator Sea Diver chronograph wristwatch with a tan leather strap on a white background.
Vintage Nivada Grenchen Chronomaster Aviator Sea Diver 105-903006 watch featuring a black dial and brown leather strap.
A Nivada Grenchen Chronomaster Aviator Sea Diver 105/9855 watch with a black dial and brown leather strap.
Black Nivada Grenchen Chronomaster Aviator Sea Diver 105-30886 watch with a black strap and silver case, featuring three subdials.