ZF Factory Jaeger-LeCoultre Master Ultra Thin Moon 39mm Cal.925
The ZF Factory Jaeger-LeCoultre Master Ultra Thin Moon is a 39mm mechanical moonphase watch built around an integrated Cal.925 movement, combining a polished stainless steel case with moonphase and date indications positioned within the subdial at 6 o’clock.
The case incorporates separate calendar and moonphase adjustment pushers on its sides, while the exhibition caseback combines stainless steel and sapphire to provide a clear view of the mechanical movement.
A calfskin leather strap with an alligator-pattern surface and butterfly clasp completes the configuration.
39mm Stainless Steel Case
The watch uses a 39mm stainless steel case with a fully polished exterior finish.
The flowing case profile extends naturally into the curved lugs, maintaining the restrained proportions associated with the Master Ultra Thin design.
The crown incorporates a raised logo detail, adding definition to the otherwise clean exterior architecture.
Calendar and Moonphase Correctors
Dedicated adjustment pushers are positioned on the sides of the case for the calendar and moonphase functions.
These correctors allow the corresponding indications to be adjusted separately when setting the watch.
Their integration into the case keeps the primary crown focused on normal winding and time-setting operations.
Moonphase and Date Display
The subdial at 6 o’clock combines two functions:
Moonphase indication and date display.
Positioning both functions within the lower section of the dial allows the main time display to remain relatively clean while concentrating the calendar information into a single visual area.
The moonphase provides the principal decorative complication, while the date adds a practical calendar indication.
Dual-Finish Hands
The hands use a distinctive two-surface finishing technique.
Different sections of each hand receive contrasting treatments, combining matte and polished surfaces.
Because these surfaces reflect light differently, the hands can show visible tonal variation depending on the viewing angle and surrounding lighting.
This detail adds visual depth without requiring additional color or decorative elements on the dial.
Integrated Cal.925 Movement
The central mechanical feature of this ZF version is its integrated Cal.925 mechanical movement.
The movement architecture is configured to operate the primary time display together with the moonphase and calendar indications.
Using an integrated movement allows the functions to be incorporated within a relatively slim Master Ultra Thin case architecture rather than relying on a visually bulky external complication layout.
Exhibition Caseback
The rear of the watch uses an exhibition caseback combining stainless steel and sapphire crystal.
The transparent sapphire section provides a view of the Cal.925 movement.
The caseback is secured by four slotted screws, while engraved branding and individual watch-number details are incorporated into the rear construction.
Polished Stainless Steel Exterior
The stainless steel case uses an overall polished finish.
Rather than combining extensive brushed and polished sections, the polished treatment creates stronger reflections across the case sides and curved lugs.
The smooth exterior treatment complements the cleaner, dress-oriented character of the moonphase dial.
Alligator-Pattern Calfskin Strap
The watch is fitted with a calfskin leather strap featuring an embossed alligator pattern.
This distinction is important: the supplied material is calfskin with a textured surface rather than exotic alligator leather.
The leather strap complements the polished stainless steel case while maintaining the traditional appearance of a dress-oriented moonphase watch.
Butterfly Clasp
The strap is secured using a butterfly folding clasp.
The folding construction opens from the center and allows the leather strap to retain a more consistent fitted shape during regular use.
Technical Specifications
Specification Details
Factory ZF Factory
Brand Jaeger-LeCoultre
Collection Master Ultra Thin
Model Master Ultra Thin Moon
Case Diameter 39mm
Case Material Stainless Steel
Case Finish Polished
Movement Cal.925
Movement Architecture Integrated Mechanical
Complications Moonphase / Date
Moonphase Position 6 o’clock Subdial
Date Display 6 o’clock Subdial
Adjustment Side Calendar / Moonphase Correctors
Hands Matte / Polished Dual Finish
Caseback Exhibition Caseback
Caseback Crystal Sapphire
Caseback Fixing Four Slotted Screws
Strap Calfskin Leather
Strap Finish Embossed Alligator Pattern
Clasp Butterfly Folding Clasp
Integrated Moonphase Architecture
The main technical characteristic of this ZF configuration is the relationship between the Cal.925 integrated movement and the combined moonphase/date display.
Both calendar-related indications are concentrated at 6 o’clock, while dedicated side correctors provide access to their adjustments.
This arrangement keeps the central dial relatively restrained despite incorporating two additional indications.
The exhibition caseback then provides a view of the integrated mechanical architecture from the reverse side.
Wearing and Care
The 39mm case diameter gives the watch relatively traditional proportions suitable for its dress-oriented design.
When adjusting the moonphase or calendar, use the dedicated correctors gently. Calendar mechanisms should not be forced if resistance is encountered.
The polished case should be cleaned with a soft microfiber cloth to minimize fine surface marks. The calfskin strap should also be protected from prolonged contact with water and moisture.
Strong impacts and powerful magnetic fields should be avoided.
Frequently Asked Questions
What is the case size of the ZF Master Ultra Thin Moon?
The watch has a 39mm stainless steel case.
What movement does this ZF version use?
It uses an integrated Cal.925 mechanical movement.
What functions are displayed at 6 o’clock?
The subdial at 6 o’clock incorporates both the moonphase and date indications.
How are the moonphase and calendar adjusted?
The case incorporates dedicated side adjustment pushers for the calendar and moonphase functions.
What is special about the hands?
The hands combine matte and polished surface treatments, allowing different sections to interact differently with light.
Can the movement be seen from the back?
Yes. The watch uses an exhibition caseback with a sapphire crystal viewing section.
How is the caseback secured?
The caseback is secured using four slotted screws.
Is the strap genuine alligator leather?
The supplied specification describes a calfskin leather strap embossed with an alligator pattern.
What type of clasp does it use?
The leather strap is fitted with a butterfly folding clasp.
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