APS Factory Jaeger-LeCoultre Master Ultra Thin Moon 39mm Cal.925
The upgraded APS Factory Jaeger-LeCoultre Master Ultra Thin Moon is a 39mm moonphase watch featuring an integrated Cal.925 mechanical movement, redesigned moonphase disc, quick-release strap system, updated clasp geometry, and applied metal dial logo.
The case measures 39mm in diameter and 9.9mm in thickness, maintaining the slim proportions that define this Master moonphase configuration.
Compared with the previous APS version, the latest release focuses on several visible and functional updates rather than simply changing the exterior appearance.
39mm Case and 9.9mm Thickness
The watch measures:
39mm diameter × 9.9mm thickness
The sub-10mm case profile is an important part of the model’s proportions, allowing the moonphase complication to be incorporated into a relatively slim mechanical watch.
The 39mm diameter also keeps the overall presentation restrained and consistent with the dress-oriented character of the Master collection.
Integrated Cal.925 Movement
The upgraded version uses an integrated Cal.925 mechanical movement.
Rather than treating the moonphase display as a purely cosmetic element, the movement architecture is configured to operate the moonphase indication as part of the mechanical display system.
The Cal.925 is one of the central technical changes defining this upgraded APS version.
Updated Moonphase Disc
One of the most noticeable differences from the previous generation is the redesigned moonphase disc.
The updated moonphase display changes the visual presentation of the lower dial and is one of the easiest ways to distinguish the newer configuration from the earlier APS version.
Together with the integrated Cal.925 movement, the revised moonphase disc forms the main functional and visual focus of the latest release.
Applied Metal Dial Logo
The dial logo has also been updated.
The previous printed treatment has been replaced by an applied metal logo, introducing additional physical depth to the dial.
Because the logo sits above the dial surface rather than appearing only as a printed graphic, it interacts more noticeably with surrounding light when the watch is viewed from different angles.
Updated Quick-Release Strap
The latest version incorporates an updated quick-release strap system.
This allows the strap to be removed and installed more conveniently without relying on conventional exposed spring-bar removal methods.
For owners who regularly change straps, the quick-release construction makes strap replacement considerably more straightforward.
Revised Folding Clasp Geometry
The clasp has also been redesigned with increased curvature.
The more pronounced curved profile allows the clasp to follow the shape of the wrist more naturally when closed.
This is a practical update to the wearing configuration rather than a purely cosmetic change.
Previous Version vs Upgraded Version
Feature Previous Version Upgraded Version
Moonphase Disc Previous-generation design Updated moonphase disc
Movement Previous configuration Integrated Cal.925
Strap System Previous strap configuration Updated quick-release system
Clasp Previous geometry Increased curvature
Dial Logo Printed logo Applied metal logo
Case Diameter — 39mm
Thickness — 9.9mm
The most important changes are therefore concentrated around the movement, moonphase presentation, dial logo, strap attachment, and clasp geometry.
Technical Specifications
Specification Details
Factory APS Factory
Brand Jaeger-LeCoultre
Collection Master
Model Master Ultra Thin Moon
Version Upgraded Version
Case Diameter 39mm
Case Thickness 9.9mm
Movement Cal.925
Movement Architecture Integrated
Complication Moonphase
Moonphase Disc Updated Version
Dial Logo Applied Metal Logo
Strap System Quick Release
Clasp Updated Curved Design
Slim Moonphase Architecture
At 39 × 9.9mm, this APS version combines a mechanical moonphase display with a case thickness below 10mm.
The restrained dimensions are particularly relevant to this model because the moonphase complication adds additional mechanical and visual information without requiring an oversized case.
The updated moonphase disc and applied metal logo provide the main visual changes on the dial, while the Cal.925 movement represents the principal mechanical update.
Wearing and Care
The 39mm diameter and 9.9mm thickness give the watch relatively restrained proportions and allow it to sit closer to the wrist.
The updated quick-release system makes strap changes more convenient, while the increased curvature of the clasp is designed to follow the wrist more naturally.
When adjusting the moonphase or other calendar-related indications, use the setting mechanism gently and avoid forcing the crown or correctors if resistance is encountered. Strong impacts and powerful magnetic fields should also be avoided.
Frequently Asked Questions
What is the size of the upgraded APS Master Moonphase?
The watch measures 39mm in diameter and 9.9mm in thickness.
What movement does the upgraded version use?
It uses an integrated Cal.925 mechanical movement.
What changed on the moonphase display?
The upgraded version introduces a new-generation moonphase disc, replacing the moonphase-disc design used on the previous version.
How can the new version be distinguished from the older version?
Key differences include the updated moonphase disc, Cal.925 integrated movement, quick-release strap, revised curved clasp, and applied metal dial logo.
Is the dial logo still printed?
No. The upgraded version uses an applied metal logo instead of the previous printed treatment.
Does the new version have a quick-release strap?
Yes. The latest configuration incorporates an updated quick-release strap system for easier strap removal and installation.
What changed on the clasp?
The clasp has increased curvature, allowing its profile to follow the wrist more naturally.
Is this a thick moonphase watch?
The supplied case thickness is 9.9mm, combined with a 39mm case diameter.
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