Jaeger LeCoultre 930

Jaeger LeCpoultre 930

Jaeger-LeCoultre is a true manufacturer; they have dozens of their own calibers which are all made in-house in Le Sentier, Switzerland in the Vallee du Joux. Though there is one movement that they co-developed and produced, yet never used themselves: the Jaeger-LeCoultre caliber 920. This movement was used by Patek Philippe in their first Nautilus 3700/1A from 1976. But it was also used in the original Royal Oak reference 5402ST from 1972 and a few other high-end watches. Today, this movement is produced by one company: Audemars Piguet. They still use it for their Royal Oak ‘Extra-Thin’ and a few of their more classical watches. It is also the base movement for some of their highly complicated watches. They also supply a few other brands with this movement (AP dubbed it caliber 2121), Vacheron Constantin being one of them. The special thing about this movement is that it is very flat at just 3.05 mm due to the rail system for the winding rotor.