Hamilton Caliber H12

Hamilton caliber H-12

Hamilton Caliber H12

Brand Hamilton
Caliber Number H-12
Based On
ETA caliber 2825-2
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 Regulator dial: Central minutes hand; hours subdial at 10:00; running seconds subdial at 4:30
Hacking Seconds?
Country of Manufacture Switzerland, Swiss made
Known Models
Hamilton Jazzmaster Regulator Auto (Ref: H42615151, H42615743, H42615143, H42615553, H42615153, H42615753)

The Hamilton caliber H-12 is a regulator style automatic movement with 25 jewels and a power reserve of about 38 hours. The H12 is a 3-hander no-date, made in Switzerland. Although the rotor is signed Hamilton, the ETA caliber number can be found under the balance wheel.

In Hamilton’s own words:

“The H-12 is a regulator movement that allows the minutes and hours to be separated from one another on the dial for maximum practical impact. Favored for watches used in situations where minutes are all-important.” –source

Hamilton H12 VS ETA 2825-2:

The H12 is a Hamilton branded version of the ETA 2825-2. Hamilton and ETA are both owned by the Swatch Group conglomerate of watch brands. Currently, ETA movements are only sold to brands within the Swatch Group. The 2825-2 that this movement is based on can also be found in other Swatch Group watches such as Tissot, with different variations such as a date and different hand layout. The 2825-2 is based on the 2824-2 framework.

Additional Resources:

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