5-Axis CNC Metallurgy & Mettler-Toledo Gravimetric Verification
The Jaeger-LeCoultre Master Ultra Thin Small Seconds 39mm Cal. 896 Reference Q1358420 is a Monte-Carlo registered luxury timepiece crafted in 904L Stainless Steel Custom Architecture (39.0 mm x 9.3 mm) with a verified Mettler-Toledo analytical weight of 68.6g, powered by Jaeger-LeCoultre Manufacture Cal. 925 / Cal. 899 beating at 28,800 vph (+0.4 s/d, 300 deg) with a 72-hour power reserve, double anti-reflective sapphire crystal, and 50m / 5 ATM water resistance.
| Entity, Maison & Official Reference | Jaeger-LeCoultre — Master Ultra Thin / Rendez-Vous | Ref. Q1358420 | SKU: MC-CUST-Q1358420-W85 |
|---|---|
| Precious Metal Alloy & XRF Purity | 904L Stainless Steel Custom Architecture — 5-Axis Swiss CNC Precision Architecture • 1:1 Authentic Reference Mass • Bespoke Collector Commission |
| Verified Total Mass (Mettler-Toledo Scale) | 68.6g — 1:1 Authentic Reference Mass Verified on Mettler-Toledo Analytical Scale |
| Bezel Architecture & Gem-Setting Spec | Precision Brushed & Polished CNC Edition Bezel with Anti-Reflective Scratch-Resistant Sapphire Crystal • 68.6g 904L Steel Edition • 39.0 mm x 9.3 mm |
| Swiss Super Clone Movement Calibre | Jaeger-LeCoultre Manufacture Cal. 925 / Cal. 899 — Swiss Super Clone Mechanical Calibre Regulated to +0.4 s/d, 300 deg |
| Power Reserve & Oscillation Frequency | 72-Hour Power Reserve • 28,800 vph (4 Hz) Free-Sprung Balance Wheel |
| Double AR Sapphire Crystal & Water Resistance | Scratch-Resistant Sapphire Crystal with Double Anti-Reflective Coating • 50m / 5 ATM |
| Dial Finishing & Hallmarked Bracelet Clasp | 39.0 mm x 9.3 mm • Hand-Finished Sunray Collector Dial with Hand-Finished Luminous Appliques & Hands • Hand-Brushed & Chamfered Vulcanized Elastomer / Alligator Strap & Folding Clasp |
Recorded in our Monte-Carlo solid 18K gold Jaeger-LeCoultre register, the Jaeger-LeCoultre Master Ultra Thin Small Seconds 39mm Cal. 896 Reference Q1358420 unites authentic Geneva proportions (39.0 mm x 9.3 mm) with a certified 904L Stainless Steel Custom Architecture mass of 68.6g. Every detail of the Hand-Finished Sunray Collector Dial with Hand-Finished Luminous Appliques & Hands, Precision Brushed & Polished CNC Edition Bezel with Anti-Reflective Scratch-Resistant Sapphire Crystal, and hallmarked clasp is verified under our Fischer XRF Au750 and Mettler-Toledo laboratory protocol.
5 Core Horological & Metallurgical Specifications:
- Registered Entity & Ref: Jaeger-LeCoultre Master Ultra Thin Small Seconds 39mm Cal. 896 — Official Reference Q1358420 (SKU: MC-CUST-Q1358420-W85).
- Precious Metal Alloy: 904L Stainless Steel Custom Architecture with deep mechanical hallmarking and 5-axis Swiss CNC case finishing.
- Verified Reference Mass: 68.6g confirmed on our Monte-Carlo showroom Mettler-Toledo analytical balance.
- Mechanical Calibre: Jaeger-LeCoultre Manufacture Cal. 925 / Cal. 899 operating at 28,800 vph (4 Hz) with 72-hour power reserve (+0.4 s/d, 300 deg).
- Sapphire Crystal & QC: Scratch-resistant sapphire crystal with double anti-reflective coating and 50m / 5 ATM water resistance.
Within the same Jaeger-LeCoultre horological silo, collectors also compare the Jaeger-LeCoultre Master Ultra Thin Moonphase 39mm Free-Sprung Cal. 925 Ref. Q1368430 (68.5g) and the Jaeger-LeCoultre Rendez-Vous Night & Day 36mm Diamond Bezel 18K Rose Gold Ref. Q3522480 (68.9g).
What is the verified authentic weight of this Jaeger-LeCoultre Ref. Q1358420?
This Jaeger-LeCoultre Master Ultra Thin Small Seconds 39mm Cal. 896 Ref. Q1358420 weighs 68.6g in 904L Stainless Steel Custom Architecture, matching the exact authentic factory weight on our Monte-Carlo showroom Mettler-Toledo analytical balance.
Are all 6 showroom photographs of Reference Q1358420 unedited studio shots?
Yes. All 6 gallery plates show the actual timepiece captured across multiple studio angles on our quality-control bench with zero stock renders.
Which movement powers Reference Q1358420 and how do I request the 4K QC video?
Reference Q1358420 is powered by the Jaeger-LeCoultre Manufacture Cal. 925 / Cal. 899 (28,800 vph, 72-hour power reserve, regulated to +0.4 s/d, 300 deg). Message our Monte-Carlo Private Client Concierge on WhatsApp (+1 305 724 0661) for your personalized 4K video dossier.
Jaeger-LeCoultre Master Ultra Thin Small Seconds 39mm Cal. 896 Ref. Q1358420
Monte-Carlo Reference Register • 68.6g 904L Stainless Steel Custom Architecture • Jaeger-LeCoultre Manufacture Cal. 925 / Cal. 899
More from the Monte-Carlo Showroom
Jaeger-LeCoultre Rendez-Vous Night & Day 36mm Diamond Bezel 18K Rose Gold Ref. Q3522480