Calibre 520⚙️ 15 jewel ⚙️ 18,800 A/h ⚙️ 1941

The Calibre 520 was the first movement produced by Eterna for men’s wristwatches. It beats at 18,000 BPH and had a power reserve of 42 hours. This service watch is still beating accurately even through all its time out in the field.

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