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The Jaeger-LeCoultre Reverso One Duetto Q334848J debuted in 2019. Housed in a stainless steel case measuring 40.1 by 20.0 mm, this manually wound Duetto model features two contrasting dials: a sunray-brushed silver front with guilloché decoration, and a deep blue reverse dial with a glittering finish and radiating hour markers. Both are framed by twin rows of brilliant-cut diamonds set along the gadroons of the case. Powering the Reverso One Duetto is 844, a hand-wound mechanical movement developed and assembled in-house. Like all Jaeger-LeCoultre timepieces, this model is subjected to the Maison’s rigorous 1,000-Hour Control quality protocol.