BLS Factory Jaeger-LeCoultre Polaris Date 42mm Green Dial
The BLS Factory Jaeger-LeCoultre Polaris Date is a 42mm automatic mechanical watch distinguished by its gradient green dial, sunray surface finishing, dual-crown case architecture, and sapphire crystal.
The case measures 13.92mm in thickness and combines brushed side surfaces with polished edges. Inside is a 9015-based automatic mechanical movement with JLC 899/1-style decorative architecture, providing a relatively slim automatic platform for the Polaris case.
Its combination of a deep gradient dial, two-crown configuration, and mixed case finishing gives this version a balance between contemporary sports-watch styling and the cleaner lines associated with the Polaris collection.
42mm Case
The watch measures:
42mm diameter × 13.92mm thickness
The case uses contrasting surface treatments rather than a uniform finish. The side surfaces are brushed, while the edges incorporate polished detailing.
This combination makes the geometry of the case more visible as the watch moves between direct and indirect light.
Gradient Green Dial
The defining feature of this configuration is its gradient green dial.
The color changes in intensity from the central area toward the outer portion of the dial, producing a deeper appearance around the perimeter.
This tonal transition gives the dial greater visual depth than a conventional single-color surface and is particularly noticeable under stronger natural lighting.
Sunray Dial Finish
Beneath the green coloration is a sunray-style surface finish.
Fine radial lines extend outward from the center of the dial and interact with the gradient color treatment.
As the viewing angle changes, different sections of the dial reflect light at different intensities. This creates the characteristic shifting appearance associated with sunray-finished watch dials.
Dual-Crown Architecture
The case uses the distinctive dual-crown configuration associated with the Polaris design.
The two crowns create one of the most immediately recognizable elements of the watch’s exterior and contribute to its combination of sporty and traditional styling.
Rather than visually concentrating all controls around a single crown, the two-crown arrangement gives the right side of the case a more technical profile.
Sapphire Crystal
The dial is protected by a sapphire crystal.
The clear crystal allows the gradient color and radial dial finishing to remain visible while providing good resistance to ordinary surface scratching.
Because the green dial uses both gradient coloration and sunray finishing, its appearance can vary considerably depending on the lighting environment and viewing angle.
9015-Based Automatic Movement
The watch is powered by a 9015-based automatic mechanical movement configured with JLC 899/1-style movement architecture and finishing.
The relatively slim 9015 platform allows the automatic winding system to be incorporated without adding unnecessary movement thickness.
Automatic winding uses normal wrist movement to provide energy to the movement during regular wear.
Exhibition Caseback
An exhibition caseback provides a view of the automatic mechanical movement.
The caseback is secured using four slotted screws, creating a structured rear-case layout around the transparent viewing area.
Engraved branding and individual watch-number details are incorporated around the caseback.
Brushed and Polished Case Finishing
The exterior uses a combination of brushed and polished surfaces.
Brushing along the case sides creates a more subdued texture, while polished edges introduce brighter reflections and visually define the outline of the case.
This contrast is particularly effective alongside the gradient green dial because both the dial and exterior surfaces respond differently as lighting conditions change.
Technical Specifications
Specification Details
Factory BLS Factory
Brand Jaeger-LeCoultre
Collection Polaris
Model Polaris Date
Case Diameter 42mm
Case Thickness 13.92mm
Dial Gradient Green
Dial Finish Sunray
Crystal Sapphire Crystal
Crown Configuration Dual Crown
Movement 9015-Based
Movement Type Automatic Mechanical
Movement Presentation JLC 899/1-Style
Case Finish Brushed Sides / Polished Edges
Caseback Exhibition Caseback
Caseback Fixing Four Slotted Screws
Green Dial and Case Design
The character of this BLS Polaris Date comes primarily from the interaction between the gradient green dial and mixed case finishing.
The radial sunray texture changes according to the direction of the light, while the gradient treatment introduces additional tonal variation from the center toward the edge of the dial.
At the same time, brushed case sides reduce reflections while the polished edges create brighter highlights.
Combined with the dual-crown configuration, these elements give the 42mm Polaris a distinctly modern sports-watch appearance without relying on an oversized case.
Wearing and Care
At 42 × 13.92mm, the watch has a substantial wrist presence while retaining relatively balanced proportions for a modern sports-oriented mechanical watch.
The sapphire crystal can be cleaned using a soft microfiber cloth. Avoid abrasive polishing materials on the case because they can alter the distinction between the brushed and polished surfaces.
As with other automatic mechanical watches, strong impacts and powerful magnetic fields should be avoided.
Frequently Asked Questions
What is the size of the BLS Jaeger-LeCoultre Polaris Date?
The case measures 42mm in diameter and 13.92mm in thickness.
What is special about the green dial?
The dial combines a gradient green color treatment with a radial sunray finish, allowing its tone and reflections to change depending on lighting and viewing angle.
What type of crystal does the watch use?
It uses a sapphire crystal.
Why does the Polaris have two crowns?
The watch uses a distinctive dual-crown case architecture, which is one of the recognizable design elements of this Polaris configuration.
What movement does the BLS Polaris Date use?
It uses a 9015-based automatic mechanical movement configured with JLC 899/1-style movement architecture and finishing.
Is the movement visible from the back?
Yes. The watch incorporates an exhibition caseback that provides a view of the automatic movement.
How is the caseback secured?
The caseback is secured by four slotted screws.
What type of case finishing is used?
The case combines brushed side surfaces with polished edges, creating visible contrast between the different exterior surfaces.
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