Hamilton Caliber H31

Brand	Hamilton
Caliber Number	H-31
Base Caliber	ETA/Valjoux 7753
Movement Type	Automatic
Jewels	27
Power Reserve	60 hours
Vibrations Per Hour	28,800
Shock System	Incabloc
Features	Chronograph, date at 6:00, 30 minutes counter at 3:00
Country of Manufacture	Switzerland
Known Models	H35756735

Found in the Hamilton Pan Europ limited edition watch, this caliber H-31 is based on the ETA/Valjoux 7753.

The H-31 variant of the 7753 features a custom designed H pattern on the bridge, and engineered for increased accuracy and an increased 60 hours power reserve instead of 42 hours.

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Also see Hamilton caliber H-21 here.