VR Factory Jaeger-LeCoultre Master Ultra Thin Perpetual Calendar 39mm Cal.868/1
The VR Factory Jaeger-LeCoultre Master Ultra Thin Perpetual Calendar is a 39mm mechanical perpetual-calendar watch built around an integrated Cal.868/1 movement.
Despite incorporating multiple calendar indications, moonphase, year display, and an adjustment warning indicator, the case measures 10.2mm in thickness.
The dial organizes the calendar information through three recessed subdials and a moonphase display, while contrasting surface treatments on the Dauphine-style hands provide additional visual depth.
39mm Case and 10.2mm Thickness
The watch measures:
39mm diameter × 10.2mm thickness
These dimensions are particularly relevant to a watch incorporating several interconnected calendar functions.
The relatively restrained 39mm diameter maintains traditional dress-watch proportions, while the 10.2mm thickness accommodates the integrated perpetual-calendar mechanism without requiring an oversized case.
Integrated Cal.868/1 Movement
The central technical feature of this VR version is its integrated Cal.868/1 mechanical movement.
The movement architecture coordinates several calendar-related indications within one mechanical system, including:
* Date
* Day of the week
* Month
* Moonphase
* Year / calendar-cycle indication
* Adjustment warning indicator
Because several of these indications are mechanically interconnected, correct adjustment procedure is particularly important.
Recessed Multi-Function Subdials
The dial uses three recessed calendar subdials rather than presenting all calendar information on a single flat surface.
The recessed construction creates physical depth between the main dial and the calendar indications.
This layered architecture is especially noticeable under directional lighting, where the edges of the recessed displays create subtle shadows around the calendar sections.
Date Display at 3 O’Clock
The date indication is positioned at 3 o’clock.
The date can be advanced using the first crown-setting position.
Because the calendar mechanism is interconnected with other indications, the date should be advanced in the intended direction rather than forced backward through the mechanism.
Month Display at 6 O’Clock
The month indication is positioned at 6 o’clock.
Adjustment is performed using the recessed corrector located around the 8 o’clock side of the case.
The month indication also forms part of the broader calendar-cycle adjustment system.
Day Display at 9 O’Clock
The day-of-week indication is positioned at 9 o’clock.
Its adjustment is linked to the time-setting operation through the crown and the progression of the 24-hour cycle.
This relationship between time and calendar indications is characteristic of the interconnected architecture of a complex calendar movement.
Moonphase Display at 12 O’Clock
The moonphase indication is positioned at 12 o’clock.
The supplied configuration uses a functional moonphase mechanism with an approximately 30-day display cycle.
The moonphase can also be adjusted through the crown-setting system, allowing the indication to be aligned without relying solely on continuous forward time adjustment.
Perpetual Calendar Function
The Cal.868/1 configuration incorporates a functional perpetual-calendar system in which multiple calendar indications operate together.
The recessed corrector around 8 o’clock provides access to the month and calendar-cycle adjustment.
The supplied year-display module covers the 2023–2028 calendar range.
This specific range should therefore be considered part of the configuration of this version rather than interpreted as an unrestricted mechanical year display.
Calendar Adjustment Warning Indicator
A particularly important feature is the sector-shaped warning window positioned above the central hand axis.
The indicator uses two states:
White: calendar functions may be manually adjusted.
Blue: calendar adjustment is in the restricted period and the calendar functions should not be operated.
This indicator is important because the calendar mechanism may already be mechanically engaged in changing its indications during the restricted period.
Forcing the date, month, moonphase, or related calendar functions while the indicator is blue can place unnecessary stress on the movement.
Dauphine-Style Dual-Finish Hands
The dial uses Dauphine-style hands with contrasting surface treatments.
One section receives a matte or sandblasted-style treatment, while the opposite section is polished.
The two finishes reflect light differently, allowing the hands to change appearance according to viewing angle.
The hour and seconds hands also incorporate a subtle curved profile.
Heat-Blued Steel Hand
The blue indication uses a heat-blued steel finish.
Rather than relying simply on blue paint, thermal bluing creates the characteristic deep blue appearance associated with traditional blued-steel watch components.
Its appearance can shift from darker blue to a brighter tone depending on lighting and viewing angle.
Movement Bridge Finishing
The movement bridges incorporate decorative surface patterning designed to give the visible mechanical architecture greater depth.
These details are particularly relevant when viewing the movement from the rear because the finishing separates the individual bridges and mechanical components visually.
Technical Specifications
Specification Details
Factory VR Factory
Brand Jaeger-LeCoultre
Collection Master Ultra Thin
Model Perpetual Calendar
Case Diameter 39mm
Case Thickness 10.2mm
Movement Cal.868/1
Movement Architecture Integrated Mechanical
Calendar Perpetual Calendar
Date 3 o’clock
Month 6 o’clock
Day 9 o’clock
Moonphase 12 o’clock
Moonphase Cycle Approx. 30 Days
Year Module 2023–2028
Adjustment Corrector Approx. 8 o’clock
Warning Indicator White / Blue
Subdials Recessed
Main Hands Dual-Finish Dauphine Style
Blue Hand Heat-Blued Steel
Calendar Adjustment Guide
Because the Cal.868/1 incorporates interconnected calendar functions, adjustment order and the warning indicator should be taken seriously.
Month
The month is displayed at 6 o’clock and can be adjusted through the recessed corrector positioned around 8 o’clock.
Day of the Week
The day is displayed at 9 o’clock and is adjusted through the crown and progression of the 24-hour time cycle.
Date
The date is displayed at 3 o’clock.
Use the first crown position to advance the date in its intended forward direction. Do not force the mechanism backward because the calendar indications are mechanically interconnected.
Moonphase
The moonphase is positioned at 12 o’clock and completes approximately one display cycle every 30 days.
The moonphase can be adjusted through the corresponding crown-setting operation.
Calendar Cycle / Year
The recessed corrector around 8 o’clock is also used as part of the month and calendar-cycle adjustment system.
This configuration incorporates a 2023–2028 year-display module.
Warning Window
Always check the central warning indicator before making calendar adjustments.
White = adjustment permitted.
Blue = do not adjust calendar functions.
When the window is blue, allow the movement to progress until the indicator returns to the permitted state before making calendar corrections.
Wearing and Care
At 39 × 10.2mm, the watch combines relatively restrained dimensions with considerably more mechanical complexity than a conventional three-hand Master Ultra Thin.
Because the Cal.868/1 contains interconnected calendar mechanisms, the crown and recessed corrector should always be operated gently.
Most importantly, do not operate the calendar adjustment functions while the warning window is blue. Never force a crown or corrector if unusual resistance is encountered.
Strong impacts and powerful magnetic fields should also be avoided.
Frequently Asked Questions
What is the size of the VR Master Ultra Thin Perpetual Calendar?
The case measures 39mm in diameter and 10.2mm in thickness.
What movement does this VR version use?
It uses an integrated Cal.868/1 mechanical movement configured for the multi-function calendar display.
Is the perpetual calendar functional?
The supplied Cal.868/1 configuration incorporates interconnected date, day, month, moonphase and calendar-cycle functions.
Where are the calendar functions displayed?
The date is at 3 o’clock, month at 6 o’clock, day at 9 o’clock, and moonphase at 12 o’clock.
What does the blue warning window mean?
A blue warning window indicates the restricted calendar-adjustment period. Calendar functions should not be manually adjusted while the indicator is blue.
What does the white warning window mean?
White indicates the calendar mechanism is in the permitted state for manual adjustment.
Can the moonphase be adjusted?
Yes. The supplied configuration allows the moonphase indication to be adjusted through the crown-setting system.
What year range does this version display?
The supplied calendar module covers 2023 through 2028.
What is special about the hands?
The Dauphine-style hands combine matte and polished surface treatments, while the blue indication uses a heat-blued steel finish.
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