V9 Factory Jaeger-LeCoultre Master Ultra Thin Perpetual Calendar 39mm
The V9 Factory Jaeger-LeCoultre Master Ultra Thin Perpetual Calendar is a 39mm automatic mechanical watch featuring a multi-function calendar system with date, day, month, year-cycle indication, moonphase display, and a calendar adjustment warning window.
The V9 configuration is available in several references, including 130842J, 1308470, 1302520, and 130354J, covering white, black, gold-tone, and grey dial variations.
The case measures 39mm in diameter and 11.5mm in thickness.
A defining feature of this version is its 2024–2029 year module, combined with a calendar system that integrates the date, day, month, year indication, and moonphase within the same mechanical display architecture.
39mm Case
The V9 Master Ultra Thin Perpetual Calendar uses a 39mm case with a thickness of 11.5mm.
The 39mm diameter keeps the overall proportions relatively restrained despite the amount of calendar information displayed across the dial.
Its 11.5mm thickness is also an important version-specific measurement and should be considered when comparing this V9 configuration with other versions of the Master Ultra Thin Perpetual Calendar.
Multi-Function Perpetual Calendar Display
The dial incorporates several mechanical calendar indications arranged around the central time display.
The principal functions include:
* Hours
* Minutes
* Seconds
* Date
* Day of the week
* Month
* Year / calendar-cycle indication
* Moonphase
* Calendar adjustment warning indicator
These indications are distributed around the dial to keep the individual calendar functions clearly separated.
Date Display at 3 O’Clock
The date indication is positioned at 3 o’clock.
The date can be manually adjusted through the crown-setting system.
Because the calendar indications are mechanically interconnected, the adjustment should be performed gently and only when the movement is outside its restricted calendar-change period.
Month Display at 6 O’Clock
The month indication is positioned at 6 o’clock.
The month can be adjusted using the recessed corrector located around the 8 o’clock position of the case.
This corrector also forms part of the adjustment system for the year/calendar-cycle indication.
Day Display at 9 O’Clock
The day-of-week indication is positioned at 9 o’clock.
The day display progresses as part of the calendar mechanism and can be advanced through the corresponding time-setting operation.
This allows the weekday indication to remain synchronized with the progression of the mechanical calendar.
Moonphase Display at 12 O’Clock
The moonphase display is positioned at 12 o’clock.
The V9 moonphase is mechanically active, but its operating cycle is an important characteristic of this particular version.
According to the supplied V9 configuration, the moonphase display completes approximately one rotation every 24 hours.
This differs from a conventional astronomical moonphase display, which progresses according to an approximately monthly lunar cycle.
For this reason, the V9 moonphase should be understood as a functional moving moonphase-style display rather than a conventional monthly moonphase indication.
2024–2029 Year Module
The current V9 configuration incorporates an updated 2024–2029 year module.
The year indication is integrated into the calendar display and can be adjusted through the recessed corrector located around the 8 o’clock position.
A notable characteristic of this configuration is its cyclic year adjustment.
The displayed years can be advanced through the available 2024–2029 range, allowing the year module to cycle through its configured indications.
The 2024–2029 range should therefore be treated as a specific technical configuration of this V9 calendar mechanism.
Calendar Adjustment Warning Window
A sector-shaped warning window is positioned above the central hand axis.
This indicator is particularly important when adjusting the calendar functions because it identifies whether the movement is currently within a safe manual-adjustment period.
The indicator has two states:
White — calendar adjustment permitted.
Blue — restricted calendar-adjustment period.
When the window is blue, the internal calendar mechanism may already be engaged in the process of changing one or more indications.
The date, month, year, or related calendar functions should therefore not be manually adjusted while the warning window is blue.
Wait until the indicator returns to white before performing calendar corrections.
Dauphine-Style Dual-Finish Hands
The watch uses distinctive Dauphine-style hands.
The hands incorporate two different surface treatments, with one section using a matte or sandblasted-style finish and the other using a polished finish.
These contrasting surfaces interact differently with surrounding light.
Depending on the viewing angle, one side of the hand can appear brighter while the opposite side remains darker, improving visual definition against the multi-function dial.
Calendar Architecture
One of the main technical characteristics of the V9 version is the way its different calendar indications interact within the same mechanical system.
The date, day, month, and year-cycle indications are not simply independent decorative displays. Their progression is coordinated through the movement’s calendar architecture.
This makes correct adjustment procedure particularly important.
The white/blue warning window should always be checked before operating the calendar system.
Available References
The supplied V9 range includes four configurations:
Reference Configuration
130842J White Dial
1308470 Black Dial
1302520 Gold-Tone Configuration
130354J Grey Dial
These different references retain the same general perpetual-calendar layout while providing different dial and exterior combinations.
Technical Specifications
Specification Details
Factory V9 Factory
Brand Jaeger-LeCoultre
Collection Master Ultra Thin
Model Perpetual Calendar
References 130842J / 1308470 / 1302520 / 130354J
Case Diameter 39mm
Case Thickness 11.5mm
Movement Type Automatic Mechanical
Calendar Multi-Function Perpetual Calendar Configuration
Date Display 3 o’clock
Month Display 6 o’clock
Day Display 9 o’clock
Moonphase 12 o’clock
Year Module 2024–2029
Year Adjustment Cyclic Adjustment
Calendar Corrector Approx. 8 o’clock
Warning Indicator White / Blue
Hands Dual-Finish Dauphine Style
V9 Moonphase Cycle Approx. One Rotation per 24 Hours
Calendar Adjustment Guide
The V9 calendar mechanism incorporates several interconnected indications, so the adjustment procedure should be followed carefully.
Before Making Any Calendar Adjustment
Always check the calendar warning window first.
White: manual calendar adjustment can be performed.
Blue: do not adjust the calendar functions.
If the indicator is blue, allow the movement to continue running until the warning window returns to white.
Never force the crown or recessed corrector if unusual resistance is encountered.
Adjusting the Date
The date is displayed at 3 o’clock.
Use the corresponding crown-setting position to adjust the date.
Because the date interacts with the broader calendar system, adjustment should only be performed while the warning indicator is white.
Adjusting the Month
The month is displayed at 6 o’clock.
Use the recessed corrector positioned around 8 o’clock to advance the month indication.
Operate the corrector with gentle, deliberate presses rather than applying continuous pressure.
Adjusting the Day
The day of the week is displayed at 9 o’clock.
The weekday indication can be advanced through the corresponding time-setting operation and progression of the calendar mechanism.
Adjusting the Year
The V9 configuration uses a 2024–2029 year module.
The year/calendar-cycle indication is adjusted through the recessed corrector around the 8 o’clock position.
The available year indications can be cycled through the configured 2024–2029 range.
Moonphase Operation
The moonphase-style display is positioned at 12 o’clock.
On this V9 configuration, the supplied specification indicates that the display completes approximately one rotation every 24 hours.
This is different from the approximately monthly cycle associated with a conventional astronomical moonphase display.
V9 Version Characteristics
Several specifications are particularly useful for identifying this V9 configuration.
The first is the 39 × 11.5mm case size.
The second is the updated 2024–2029 year module with cyclic adjustment.
The third is the white/blue calendar adjustment warning window, which provides a visual indication of when the calendar mechanism should not be manually adjusted.
The fourth is the moonphase implementation. Although mechanically active, its approximately 24-hour rotation differs from a conventional monthly lunar-cycle display.
These characteristics are useful when comparing the V9 version with other Master Ultra Thin Perpetual Calendar configurations.
Wearing and Care
At 39mm in diameter and 11.5mm in thickness, the V9 maintains a relatively compact case diameter while accommodating several calendar indications.
Because the calendar mechanism contains multiple interconnected components, adjustment should always be performed carefully.
Most importantly:
Do not manually adjust the calendar functions while the warning window is blue.
If the crown or recessed corrector develops unusual resistance, stop rather than forcing the mechanism.
Strong impacts and powerful magnetic fields should also be avoided.
Frequently Asked Questions
What is the size of the V9 Master Ultra Thin Perpetual Calendar?
The watch measures 39mm in diameter and 11.5mm in thickness.
What functions does the V9 calendar system provide?
The watch incorporates date, day, month, year/calendar-cycle and moonphase displays, together with conventional hours, minutes, and seconds.
Where is the date displayed?
The date is positioned at 3 o’clock.
Where is the month displayed?
The month is positioned at 6 o’clock.
Where is the day of the week displayed?
The day indication is positioned at 9 o’clock.
Where is the moonphase display?
The moonphase-style display is located at 12 o’clock.
What years does the current V9 module display?
The current version uses a 2024–2029 year module.
Can the year display be adjusted cyclically?
Yes. The V9 configuration allows the available year indications to cycle through the 2024–2029 range.
What does the white warning window mean?
A white warning window indicates that the calendar mechanism is in a period where manual calendar adjustment is permitted.
What does the blue warning window mean?
Blue indicates the restricted calendar-adjustment period. The calendar functions should not be manually adjusted while the window is blue.
Does the V9 moonphase follow a normal monthly lunar cycle?
No. According to the supplied V9 configuration, the moonphase-style display completes approximately one rotation every 24 hours, rather than following a conventional monthly lunar cycle.
What dial configurations are available?
The supplied range includes 130842J white dial, 1308470 black dial, 1302520 gold-tone configuration, and 130354J grey dial.
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