Ref. Q1338421
The Jaeger-LeCoultre Master Ultra Thin Automatic (reference Q1338421) is a 39mm stainless steel with a automatic movement and 50m of water resistance. It carries a silver dial. On the secondary market it typically trades between $4,500 and $8,000.
Confirmed secondary-market sales WristWorth has tracked for this reference.
No manufacture has produced more calibers than Jaeger-LeCoultre — over 1,200 since Antoine LeCoultre founded the workshop in Le Sentier in 1833. JLC has quietly supplied movements to Patek Philippe, Audemars Piguet, and Vacheron Constantin throughout its history, earning it the nickname 'the watchmaker's watchmaker.' The Reverso (1931), designed for polo players who needed a protected dial, is an Art Deco masterpiece still in production. The Master Control line delivers observatory-grade precision, while the Atmos clock runs on temperature changes alone. For the collector who values movement finishing and complication depth over brand recognition, JLC is arguably the best value proposition in haute horology.
Atmos Clock
Q5085420
Master Control Calendar
Q1548530

Master Control Chronograph
Q4148420
Master Grande Tradition Tourbillon
Q5008580
Master Ultra Thin 39mm
Q1218420
Master Ultra Thin Black
Q1218421

Master Ultra Thin Moon
Q1548420

Master Ultra Thin Moon 36mm
Q1248421
On the secondary market the Jaeger-LeCoultre Master Ultra Thin Automatic (reference Q1338421) typically trades between $4,500 and $8,000, with a midpoint around $6,250. Actual prices vary with condition, box/papers, and demand.
The Q1338421 runs a automatic movement (caliber 896).
The Q1338421 has a 39mm Stainless Steel case, water resistant to 50m, with a silver dial.
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