1940s Eterna chronograph triple date with Valjoux 72c

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Eterna was a pioneer of mid-century technical complications, and this 1940s chronograph is a masterclass in mechanical symmetry. It houses the legendary Valjoux 72c, a highly complex manual-wind movement that layers a full triple calendar (day, date, month) over a three-register chronograph. With its wartime aesthetic and complex dial tracks, it is an intellectual collector's trophy that showcases the absolute peak of 1940s engineering.