Hamilton Caliber H12

Hamilton caliber H-12

Hamilton Caliber H12

BrandHamilton
Caliber NumberH-12
Based On
ETA caliber 2825-2
Movement TypeAutomatic, self-winding mechanical
Lignes11.5”’
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
FunctionsRegulator dial: Central minutes hand; hours subdial at 10:00; running seconds subdial at 4:30
Hacking Seconds?
Yes
Country of ManufactureSwitzerland, 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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Venus Caliber 178
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