Jaeger-LeCoultre Duometre Quantieme Lunaire

JLC flexing, and one of the more technically distinctive things in haute horlogerie. Duometre is built on the maison's 'Dual-Wing' concept: two separate power sources and gear trains sharing a single regulator, so engaging a complication draws its energy from its own barrel and never robs torque from the timekeeping, protecting accuracy. The payoff is a beautifully symmetrical dial with twin subdials and twin power reserves. Fully relaunched in 2024, it runs from the Quantieme Lunaire up to a limited Heliotourbillon. This is JLC for the collector who cares about what's happening under the dial.