Vacheron Constantin Traditionnelle Day-Date and Power Reserve (ref. 85290/000R-B405) fits the bill. The case is 39.5mm in diameter and equipped with the cal. 2475 SC, an in-house automatic movement with a 40-hour power reserve.
The movement was originally developed by Jaeger-LeCoultre as the cal. 920 in 1967. Its longevity is due to its height – just 2.45mm high – reliability and sophisticated, full-rotor design that’s uncommon for such a thin calibre.
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