|Base Caliber||ETA/Valjoux 7753|
|Power Reserve||60 hours|
|Vibrations Per Hour||28,800|
|Features||Chronograph, date at 6:00, 30 minutes counter at 3:00|
|Country of Manufacture||Switzerland|
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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