| 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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