Jaeger-LeCoultre Master Ultra Thin Master Ultra Thin Date Stainless Steel / Silver / Alligator
Reference Q1238421
About this watch
The Jaeger-LeCoultre Master Ultra Thin Date Q1238421 debuted in 2025.
With its clean lines and restrained elegance, the Master Ultra Thin Date in stainless steel is a study in refined proportions. Its polished 39 mm case measures just 7.89 mm thick, housing an automatic movement with date function. On the silvered sunray-brushed dial, the redesigned elongated hour markers and dauphine hands enhance legibility, while the date aperture now resides at 6 o’clock for a more symmetrical display.
The watch is paired with a black alligator leather strap, secured with a stainless steel double folding clasp. Like all Jaeger-LeCoultre watches, the Q1238421 has passed the stringent “1,000 Hours Control” testing regime.
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Specifications
- Brand
- Jaeger-LeCoultre
- Family
- Master Ultra Thin
- Model
- Master Ultra Thin Date Stainless Steel / Silver / Alligator
- Reference
- Q1238421
- Movement
- 899-1
- Movement Features
-
- Hours, Minutes, Seconds
- Date
- Case
- Stainless Steel 39mm
- Dial Color
- Silver
- Crystal
- Sapphire
- Water Resistance
- 50
Current Listings
![[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
2023 JLC Moonphase Master Ultra Thin
The Jaeger-LeCoultre Master Ultra Thin Moon combines a refined, minimalist design with the sophisticated complication of a moon phase indicator in a sleek, ultra-thin case that measures just 9.3mm thin.
- Condition: Excellent Unworn Condition
- Case Material: Stainless steel
- Dial Color: Silver-Grey
- Movement Type: Automatic