Jaeger-LeCoultre Master Ultra Thin Master Ultra Thin Réserve de Marche Stainless Steel / Silver / Alligator
Reference 1378420
About this watch
The Jaeger-LeCoultre Master Ultra Thin Réserve de Marche is a masterpiece of horological art, showcasing precision and elegance in its round 39mm case with a height of just 9.9mm. The stainless steel case exudes a sophisticated shine, while the sunburst finish on the silver dial adds depth and character. A gem-set bezel adds a touch of extravagance without overpowering the simplicity of the design. The Jaeger-LeCoultre caliber 938 mechanical automatic winding movement is a marvel of engineering, boasting 273 parts and 41 jewels, with a frequency of 28,800 vibrations per hour. This watch provides a wealth of information with indications for hours, minutes, small seconds, date, and power reserve indicator. Its slim profile and lightweight feel make it comfortable for all-day use. With a water resistance of up to 50 meters, you can wear it confidently while washing your hands or caught in the rain.
Buy Now on Jomashop
This is an affiliate link
Key Features
- 39mm round stainless steel case
- 9.9mm height for ultimate wearability
- Jaeger-LeCoultre caliber 938 mechanical automatic winding movement
- Sapphire glass for scratch resistance
- 43-hour power reserve indicator
- Water resistance up to 50 meters
- Gem-set bezel for a touch of luxury
Specifications
- Brand
- Jaeger-LeCoultre
- Family
- Master Ultra Thin
- Model
- Master Ultra Thin Réserve de Marche Stainless Steel / Silver / Alligator
- Reference
- 1378420
- 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
Jager LeCoultre Q1378420 Master Reserve de Marche
Jager LeCoultre Master Reserve de Marche, a stainless steel watch with automatic movement and power reserve indicator.
- Condition: Excellent
- Case Size: 39mm diameter
- Thickness: 10mm
- Water Resistance: 100ft
![[WTS] Jaeger-LeCoultre Master Ultra Thin Small Seconds 39mm Pink Gold Q1212510](https://preview.redd.it/i4zcktiat68g1.jpg?width=640&crop=smart&auto=webp&s=480dc3c930c953993d892ac1b8eae3020f62a9b3)
Jaeger-LeCoultre Master Ultra Thin Small Seconds 39mm Pink Gold Q1212510
A Jaeger-LeCoultre Master Ultra Thin Small Seconds in pink gold with a 39mm case size.
- Condition: Very good, rated at 9.7/10
- Case Size: 39mm
![[WTS] Jaeger-LeCoultre Master Ultra Thin Moon Rose Gold Box and Papers Q1362510](https://preview.redd.it/jyo1ltz6o28g1.jpg?width=640&crop=smart&auto=webp&s=572516763603d4e3c7db363933c38baa1fef4ca1)
Jaeger-LeCoultre Master Ultra Thin Moon Rose Gold Box and Papers Q1362510
- Case material: rose gold
- Box and papers: yes
![[WTS] Jaeger-LeCoultre Master Ultra Thin Moon – 39mm – Warranty to 2031](https://preview.redd.it/p54i82z6qt7g1.jpeg?auto=webp&s=6eb0a4d1cdae42352607751a7a64186cd2863aaf)
Jaeger-LeCoultre Master Ultra Thin Moon – 39mm – Warranty to 2031
The Jaeger-LeCoultre Master Ultra Thin Moon is an elegant and striking watch featuring a reworked 39mm case, updated moonphase disc, and new-generation Caliber 925 movement with 70-hour power reserve.
- Case size: 39mm
- Movement: Caliber 925 with 70-hour power reserve
![[WTS] Classic Design: Jaeger-LeCoultre Master Ultra Thin Date](https://preview.redd.it/ygl82lhg487g1.jpeg?auto=webp&s=50c358633c4961532fa6c7b6c538d9f25ddae3f8)
Classic Design: Jaeger-LeCoultre Master Ultra Thin Date
The Jaeger-LeCoultre Master Ultra Thin Date features a 39mm stainless steel case, silvered sunray-brushed dial, and black leather strap. It is powered by the automatic JLC caliber 899 movement.
- Condition: Excellent condition
- Case size: 39mm diameter
- Movement: Jaeger-LeCoultre caliber 899 automatic
![[WTS] Jaeger-LeCoultre Master Ultra Thin Moon - Complete - Warranty to 2030](https://preview.redd.it/ndu9tu2ofo6g1.jpeg?auto=webp&s=3a36ef9ee3f8b83e2dd722f55cbdac9f61a8ed0e)
Jaeger-LeCoultre Master Ultra Thin Moon - Complete - Warranty to 2030
The Jaeger-LeCoultre Master Ultra Thin Moon features a reworked 39mm case, updated moonphase disc with sharper detailing and a more vivid contrast against the dial, powered by an updated new-generation Caliber 925 movement with 70-hour power reserve.
- Condition: Excellent condition all around
- Case size: 39mm diameter
- Movement: Caliber 925 movement with 70-hour power reserve
![[WTS] Here's to Special Watches ✨ Jaeger-LeCoultre Master Ultra Thin Tourbillon - Rose Gold - 40mm](https://external-preview.redd.it/Mm90bDNkbjFzNzZnMc759IRhaq6cjVz_tatgefDVzRQHQytIWNBthhQ3SJit.png?format=pjpg&auto=webp&s=2b15e278c7ce42712d941fdf22e2b41dd3a7b90b)
Here's to Special Watches ✨ Jaeger-LeCoultre Master Ultra Thin Tourbillon - Rose Gold - 40mm
A Jaeger-LeCoultre Master Ultra Thin Tourbillon featuring an automatic tourbillon, 40mm rose gold case, and Beige Eggshell dial.
- Condition: Excellent overall condition
- Case size: 40mm diameter
- Thickness: 11mm
- Movement: Jaeger-LeCoultre caliber 982 with Tourbillon Escapement
BNIB Jaeger-LeCoultre MASTER ULTRA THIN MOON STAINLESS STEEL 2025 FULL SET
A Jaeger-LeCoultre Master Ultra Thin Moonphase watch in stainless steel with a silver dial, featuring a 39mm case and a black alligator leather strap. The watch is complete with its original packaging and comes under an 8-year factory warranty.
- Condition: Brand New In Box (BNIB)
- Case size: 39mm
- Material: stainless steel
- Strap material: black alligator leather
BNIB Jaeger-LeCoultre MASTER ULTRA THIN DATE BLUE DIAL Q1238480 2025 FULL SET
This is a brand new Jaeger-LeCoultre Master Ultra Thin Date with a blue dial and 39mm stainless steel case, on a black alligator leather strap.
- Condition: Brand new in box (BNIB)
- Case size: 39mm
- Material: stainless steel