Here we have another two new pieces also just unveiled at 2015 Watches & Wonders in Hong Kong. The new Vacheron Constantin Patrimony Ultra-Thin Calibre 1731 is the thinnest manual wound calibre and the thinnest manual wound minute repeater watch on the market, at respectively 3.9 and 8.1 mm thick. Initially introduced in 18K 5N pink gold, this timepiece now appears clothed in a platinum case —framing a silvered opaline or slate-colored opaline dial— naturally bearing the prestigious Hallmark of Geneva. The first repeater watch appeared in the 18th century in an age before the advent of electric lighting. The timepiece enabled its owner to tell the time in the dark by means of an audible indication. While this complication is no longer an imperious necessity, it nonetheless remains a pinnacle of the watchmaking art. Each minute repeater watch is indeed unique and carries the signature of the master artisan who made it.