Jaeger-LeCoultre Master Ultra Thin Date — Ref. Q1238420
Video footage available upon request. Open to offers. Bracelet sizing service available.
About This Reference
The Master Ultra Thin Date distills Jaeger-LeCoultre's century-long pursuit of thinness into one of the most refined daily-wear dress watches in production. At just 7.8mm thick with a 39mm case, the Q1238420 achieves a profile that disappears under a shirt cuff while retaining enough wrist presence to stand on its own. The silvered grey sunray-brushed dial features elongated, polished rhodium-plated hour markers that catch light with a precision that echoes the movement finishing visible through the transparent caseback — Côtes de Genève bridges, blued screws, and an engraved oscillating weight presented without pretence behind sapphire crystal. A date aperture at 6 o'clock sits symmetrically opposite the brand name at 12, maintaining the visual balance that defines the Master Ultra Thin philosophy. Inside, the calibre 899/1 stands just 3.30mm tall — one of the thinnest automatic date movements in the Swiss industry — and every example passes Jaeger-LeCoultre's proprietary 1,000-hour quality control programme before leaving the Vallée de Joux.
Specifications
Model: Jaeger-LeCoultre Master Ultra Thin Date
Reference: Q1238420
Caliber: 899/1 (Jaeger-LeCoultre manufacture, automatic, 219 components, 32 jewels, 28,800 vph / 4 Hz, movement height 3.30mm)
Case: Stainless steel, 39mm × 7.8mm
Bezel: Fixed, smooth stainless steel
Crown: Pull/push
Crystal: Sapphire with anti-reflective coating on inner surface
Caseback: Transparent sapphire
Dial: Silvered grey, sunray-brushed, polished rhodium-plated elongated hour markers, steel dauphine hands, date aperture at 6 o'clock
Strap: Novonappa® vegetable-tanned brown calfskin leather with quick-release spring bars
Clasp: Stainless steel double-fold deployment clasp
Movement: Automatic
Power Reserve: Approximately 38 hours
Water Resistance: 50m / 5 bar
Functions: Hours, minutes, central seconds, date
Condition Report
Overall condition is excellent. The watch is unpolished.
- Case: 10/10 — no visible marks
- Bezel: 10/10 — no visible marks
- Crystal: 10/10 — no visible marks
- Dial/Hands: 10/10 — no visible marks
- Strap: 10/10 — no visible marks
- Clasp: 10/10 — no visible marks
- Caseback: 10/10 — no visible marks
Photos taken on strap at standard length, fitting approximately 16–20cm (6.3–7.9 inch) wrists.
Delivery Contents
- Watch (complete set)
- Original inner and outer boxes
- Warranty card (dated 2022)
- All papers and booklets
- Please refer to photos for full contents
Service & Authenticity
The watch has been run on a timegrapher and is performing within specification. No prior service history. Standard 2-year manufacturer warranty has expired; extended 8-year coverage may apply if registered through Jaeger-LeCoultre Care.
Shipping & Legal
- Ships from: Huntsville, AL
- Shipping: Fully insured overnight with tracking provided
- Shipping within CONUS only
- Buyers are responsible for any applicable taxes and duties
- Watch is sold in accordance with United States laws and regulations
Questions?
All watches are inspected by our watchmakers for condition, authenticity, and functionality before sale. Feel free to reach out via messenger with any questions.