ETA Caliber 2825-2 Watch Movement

Manufacturer	ETA
Caliber Number	2825-2
Based Caliber	ETA 2824-2
Movement Type	Automatic, self-winding mechanical
Lignes	11.5”’
Diameter	25.6mm
Jewels	25
Beat Rate	28,800 vph, 4Hz
Power Reserve	~38 hours
Rotor Style	Ball bearing
Hand-Windable?	Yes
Anti-Shock Device	Novodiac
Hand Count	3
Functions	Depends on the watch: small seconds subdial at 6:00 / regulator style / offset hours, minutes, seconds / date at 3:00, 6:00, or 9:00
Hacking Seconds?	Yes
Country of Manufacture	Switzerland, Swiss made
Known Models	Hamilton Khaki Field Officer 44, Hamilton (H-12, H-22 powered watches), Tissot Le Locle Petite Seconds, Tissot Tradition Automatic Small Seconds, Tissot Couturier Small Seconds, Certina DS-4 Small Second, (Add your watch to the comments below…)

The ETA caliber 2825-2 is an automatic movement with a variety of configurations depending on the watch. This Swiss made caliber has 25 jewels and a power reserve of about 38 hours. It is based on the 2824-2 framework.

The 2825-2 can be found in various Swatch Group watches such as Hamilton and Tissot. These brands may have their own caliber numbers (the Hamilton caliber H12 pictured above for example), as well as variations with date/no-date and different hand layouts.

Known Configurations:

Central hours; central minutes; small seconds at 6:00 (base configuration)

Regulator style with central minutes; hours subdial near 10:00; small seconds subdial near 4:30

Offset hours and minutes subdial around 1:00-2:00; small seconds around 8:00

Date Window Locations:

Variants of the 2825-2 are known to have a date calendar displayed at 3:00, 6:00, or 9:00. There is at least one no-date version used by Hamilton as their caliber H-12.

Additional Resources: