Hamilton Caliber H12

ETA Caliber 2825-2

Hamilton Caliber H12

Manufacturer ETA
Caliber Number 2825-2
Based Caliber
ETA 2824-2
Movement Type Automatic, self-winding mechanical
Lignes 11.5”’
Beat Rate
28,800 vph, 4Hz
Power Reserve
~38 hours
Rotor Style
Ball bearing
Anti-Shock Device
Hand Count
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?
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:

Venus Caliber 178

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