Hamilton Caliber H31

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.