Jaeger-LeCoultre Master Ultra Thin Master Ultra Thin Réserve de Marche Stainless Steel / Silver / Alligator
Reference Q1378421
About this watch
The Jaeger-LeCoultre Master Ultra Thin Power Reserve Q1378421 debuted in .
This elegant stainless steel dress watch features a 39 mm case with polished and satin-finished surfaces, framing a silvered sunray dial. Refined elements include elongated hour markers, dauphine hands, and three recessed opaline subdials for the power reserve, date, and small seconds functions—each laid out in a symmetrical and harmonious arrangement.
Inside ticks the automatic caliber 938, developed and manufactured in-house by Jaeger-LeCoultre. With a silicon escapement and a single barrel, it delivers a 70-hour power reserve. The Q1378421 is paired with a light brown leather strap fitted with a stainless steel double folding clasp.
Buy Now on Jomashop
This is an affiliate link
Specifications
- Brand
- Jaeger-LeCoultre
- Family
- Master Ultra Thin
- Model
- Master Ultra Thin Réserve de Marche Stainless Steel / Silver / Alligator
- Reference
- Q1378421
- Movement
- 938
- Movement Features
-
- Hours, Minutes, Small Seconds
- Date
- Power Reserve Indicator
- Case
- Stainless Steel 39mm
- Dial Color
- Silver
- Crystal
- Sapphire
- Water Resistance
- 50
Current Listings

Jaeger LeCoultre Master Ultra Thin Moon - 39mm - 1368430 ( unworn / 2024 )
This Jaeger LeCoultre Master Ultra Thin Moon is a stainless steel automatic watch with a 39mm case. It features the JLC Calibre 925 movement and comes complete with all original boxes, papers, and warranty card.
- Condition: Unworn
- Case material: Stainless Steel
- Case size: 39mm
- Movement type: Automatic