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The Master Ultra Thin collection epitomizes Jaeger-LeCoultre’s philosophy of uniting technical virtuosity with timeless aesthetics, reimagining traditional complications with designs that feature rich, clean lines. The Réserve de Marche ref. Q1378420 exemplifies this vision, featuring a 39mm stainless steel case that frames a radiant silver sunray dial where rhodium-plated markers, dauphine hands, and blued steel accents create a subtle interplay of textures and tones. Its asymmetrical layout — featuring a date at 2 o’clock, small seconds at 6, and a power-reserve indicator at 10 — is purposefully designed for optimal legibility and aesthetic balance. Inside this watch is the in-house calibre 938, tested to JLC’s exacting 1,000 Hours Control standards, which underscores the exceptional finishing and craftsmanship expected of the “watchmaker’s watchmaker.”
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This watch is in excellent condition, showing light signs of modest wear such as scratches and small dings. The movement is running properly with all functions operating as intended. Additional photos are available on request.
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This watch comes as a complete set with its original boxes, booklets, date adjustment pusher, and warranty card dated to October 2019. Please note that some of the black material on the box shows signs of deterioration.
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Brand: Jaeger-LeCoultre
Model: Master Ultra Thin Réserve de Marche
Reference: Q1378420 / 176.8.38.S
Year: 2019
Case size: 39mm
Lug-to-lug: 45.7mm
Case thickness: 9.9mm
Case material: Stainless steel
Dial color: Silver
Movement: JLC calibre 938
Complications: Date, power reserve indicator
Water resistance: 50 meters
Strap/bracelet: Generic replacement black leather strap with original Jaeger-LeCoultre stainless steel butterfly clasp
Lug width: 21mm