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.
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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
![[WTS] Jaeger-LeCoultre Master Ultra Thin Moon Ref:Q1368471 Full Set](https://preview.redd.it/e0aj64j8ec1h1.jpg?width=640&crop=smart&auto=webp&s=f0fc16126418489af18e5747cf7f49d150d8ccc9)
Jaeger-LeCoultre Master Ultra Thin Moon Ref:Q1368471 Full Set
A 39mm Jaeger-LeCoultre Ultra Thin Moon with an updated Caliber 925 movement and 70 hour power reserve is up for sale. The watch comes complete with its box, papers, travel pouch, and warranty card.
- Condition: Excellent condition, slight wear on the strap
- Case size: 39mm
- Movement: Caliber 925
- Power reserve: 70 hours
![[WTS] 2024 Jaeger LeCoultre Master Ultra Thin Moon. Q1368480. Gorgeous Blue Dial. Warranty through 2032. $7,600.](https://preview.redd.it/a14yaszhuy0h1.jpg?width=640&crop=smart&auto=webp&s=eddce9fa40fcbaae0a4f0fe7ed7aa9b86f1a03df)
2024 Jaeger LeCoultre Master Ultra Thin Moon. Q1368480. Gorgeous Blue Dial. Warranty through 2032. $7,600.
A beautiful Jaeger LeCoultre Master Ultra Thin Moon with a deep blue sunray dial, dated March 2024, and an extended warranty running through 2032.
- Condition: Excellent condition with some wear on the strap
- Warranty expiration year: 2032
![[WTS] Jaeger LeCoultre Master Ultra Thin Moon 39mm 1368430 ( unworn / 2026 / box and papers )](https://preview.redd.it/5h0zsp6chx0h1.jpg?width=640&crop=smart&auto=webp&s=cbe21ae7982465cb3568f632a2970939b2c5fc91)
Jaeger LeCoultre Master Ultra Thin Moon 39mm 1368430 ( unworn / 2026 / box and papers )
This is an unworn Jaeger LeCoultre Master Ultra Thin Moon, a 39mm stainless steel automatic watch with the JLC Calibre 925 movement.
- Condition: Unworn
- Case diameter: 39mm
- Case material: Stainless Steel
- Movement: JLC Calibre 925
![[WTS] GRAIL DRESS WATCH! Jaeger-LeCoultre Master Ultra Thin Moon Phase in 18K Pink Gold Full 2023 Set Ref Q1362580](https://external-preview.redd.it/YmN5bjhicDNlZjBoMT0DBEchap6voCTWgRTwOnpv0G-xB2Tzjrj-ZG-J8g1j.png?format=pjpg&auto=webp&s=e74dad02aaf990d7ecebcfef1ba18f369d5848b0)
GRAIL DRESS WATCH! Jaeger-LeCoultre Master Ultra Thin Moon Phase in 18K Pink Gold Full 2023 Set Ref Q1362580
A stunning Jaeger-LeCoultre Master Ultra Thin Moon Phase in 18K pink gold with a gorgeous gradient blue dial, featuring a moon phase sub-dial and a sapphire crystal case back.
- Condition: Full set, clean condition, 2.5 years old, under warranty
- Case diameter: 39mm
- Case thickness: 9mm
- Movement: Automatic Cal. 925
![[WTS] JLC Jaeger-LeCoultre Master Ultra Thin Reserve de Marche](https://preview.redd.it/8dk9ge0yp80h1.jpeg?auto=webp&s=a5901e16ad424d4f6d8d5567055309a125caf4c0)
JLC Jaeger-LeCoultre Master Ultra Thin Reserve de Marche
A Jaeger-LeCoultre Master Ultra Thin Reserve de Marche, purchased in 2016. The watch features a replaced buckle, as documented by JLC, and includes original records.
- Condition: Excellent
- Box And Papers: Yes
![[WTS] GRAIL MODERN DRESS WATCH! Jaeger-LeCoultre Master Ultra Thin Moon Phase in 18K Pink Gold Full 2023 Set Ref Q1362580](https://external-preview.redd.it/c2lmMDV4NDhjMXpnMT0DBEchap6voCTWgRTwOnpv0G-xB2Tzjrj-ZG-J8g1j.png?format=pjpg&auto=webp&s=24d12c3ceb2364c043dd44668463d5a482b08a30)
GRAIL MODERN DRESS WATCH! Jaeger-LeCoultre Master Ultra Thin Moon Phase in 18K Pink Gold Full 2023 Set Ref Q1362580
This Jaeger-LeCoultre Master Ultra Thin Moon Phase in 18K pink gold features a gorgeous gradient blue dial and is a modern dress watch perfection with sharp lines and deep gold hallmarks.
- Condition: Clean condition, full set with original accessories
- Case diameter: 40mm
- Movement power reserve: 70 hour
![[WTS] Jaeger-LeCoultre Master Ultra Thin Moon, ref. Q1368480 Blue](https://preview.redd.it/5qjhgp995yyg1.jpeg?auto=webp&s=6b0e6e9f1dcc8dd9b090170df0017f73b0cac3c5)
Jaeger-LeCoultre Master Ultra Thin Moon, ref. Q1368480 Blue
The Jaeger-LeCoultre Master Ultra Thin Moon in stainless steel features a blue sunray-brushed dial with rhodium-plated hour markers. The watch has a slim profile at 39mm across and 9.3mm thick.
- Condition: like-new
- Case diameter: 39mm
- Thickness: 9.3mm
- Water resistance: 5 bar
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