Vacheron Constantin Artelier Cabinotiers 80173 ‘Philosophia' 80173/000R9483

The name was the owner's choice. Based on a Patrimony, the Philosophia shows only the hours, with one central hand; a slide sets off the minute repeater when the precise time matters. Under the silvered opaline dial is the hand-wound calibre 2755, stamped with the Hallmark of Geneva, which also drives a 60-second tourbillon visible at 6 o'clock, a moon phase with craters and a pole star, and a power-reserve indicator on the back, good for about 58 hours.

Instead of the usual 1/1, the case is marked "No Un/Un" at the owner's request, beside the Les Cabinotiers engraving. Vacheron Constantin delivered it to its owner in 2011. The Vladimir (80253/000R-9593), another pink gold Atelier Cabinotiers commission, is larger at 47 mm and carries 17 complications.