GF Factory Jaeger-LeCoultre Master Ultra Thin Réserve de Marche 39mm
The GF Factory Jaeger-LeCoultre Master Ultra Thin Réserve de Marche is a 39mm mechanical watch combining a slim stainless steel case with a multi-function dial and power-reserve indication.
With a case thickness of 9.9mm, the watch maintains relatively restrained proportions while accommodating its additional mechanical displays. Inside is an integrated 938/1 mechanical movement, configured around the functions of the Réserve de Marche design.
39mm Stainless Steel Case
The watch uses a 39mm stainless steel case with a thickness of 9.9mm.
These proportions are central to the character of the Master Ultra Thin design. The relatively compact diameter keeps the watch restrained on the wrist, while the sub-10mm thickness maintains a slim side profile despite the additional dial functions.
Power Reserve Display
A defining complication of the Réserve de Marche is its power-reserve indication.
Rather than requiring the wearer to estimate the remaining running time of the mechanical movement, the dedicated display provides a visual indication of the movement’s available stored energy.
This function also forms an important part of the asymmetric multi-function dial layout.
Multi-Function Dial
The Réserve de Marche uses a more complex dial architecture than a conventional three-hand Master Ultra Thin.
Its additional indications are distributed across the dial while retaining the clean proportions associated with a dress-oriented mechanical watch.
The result combines practical mechanical information with a visually distinctive layout without requiring a substantially larger case.
Integrated 938/1 Movement
The GF version uses an integrated 938/1 mechanical movement.
The integrated architecture is configured to operate the watch’s primary time display together with its additional indications, including the power-reserve function.
This movement configuration is one of the principal technical characteristics distinguishing the Réserve de Marche from simpler Master Ultra Thin models.
Slim Mechanical Architecture
Combining additional mechanical functions with a 9.9mm case thickness is an important aspect of this configuration.
The 39mm diameter provides sufficient dial area to separate the different indications clearly, while the relatively slim profile prevents the watch from taking on the proportions of a larger sports or complication watch.
This balance between mechanical functionality and restrained dimensions defines much of the model’s character.
Technical Specifications
Specification Details
Factory GF Factory
Brand Jaeger-LeCoultre
Collection Master Ultra Thin
Model Réserve de Marche
Case Diameter 39mm
Case Thickness 9.9mm
Case Material Stainless Steel
Movement 938/1
Movement Architecture Integrated Mechanical
Complication Power Reserve Display
Dial Multi-Function Display
Wearing and Care
At 39 × 9.9mm, the watch has relatively compact proportions for a mechanical model incorporating additional indications.
When setting or adjusting the watch, operate the crown and adjustment mechanisms gently. Avoid forcing any mechanism if unusual resistance is encountered.
Strong impacts and powerful magnetic fields should also be avoided to help protect the mechanical movement.
Frequently Asked Questions
What is the size of the GF Master Ultra Thin Réserve de Marche?
The case measures 39mm in diameter and 9.9mm in thickness.
What material is used for the case?
The watch uses a stainless steel case.
What movement does this GF version use?
It uses an integrated 938/1 mechanical movement.
Does the watch have a power-reserve indicator?
Yes. Power-reserve indication is one of the defining complications of the Réserve de Marche.
What does the power-reserve display do?
It provides a visual indication of the mechanical movement’s remaining stored energy.
Is this a conventional three-hand watch?
No. The Réserve de Marche uses a multi-function dial architecture incorporating additional mechanical information, including the power-reserve display.
How thick is the watch?
The supplied case thickness is 9.9mm.
Is “Jaeger-LeCoultre Joker” the model name?
“Joker” is a market nickname sometimes used for this configuration. The model name used here is Master Ultra Thin Réserve de Marche.
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