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The 5D Watches Blog

Insights, stories, and expert knowledge about luxury watches, horology, and timepieces from around the world.

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Jaeger-LeCoultre Master Control Chronometre: The 1,000-Hour Test Behind the New Collection

Jaeger-LeCoultre Master Control Chronometre: The 1,000-Hour Test Behind the New Collection

Jaeger-LeCoultre stacks its own 1,000 Hours Control on top of COSC certification for the Master Control Chronometre line. A working dealer's read on what the High Precision Guarantee actually tests, the Q4158120 Date and Q4178180 Perpetual Calendar references, and what it means for a pre-owned buyer.