U-Boat Darkmoon Watch - Multicolor

The visible air bubble is a functional element designed to compensate for temperature variations within the oil-filled case, ensuring the oil's viscosity remains consistent for optimal performance and legibility.

To adjust the time, gently unscrew the crown (located on the left side) by turning it counter-clockwise. Pull the crown out to the setting position, adjust the hands to the correct time, and then push the crown back in and screw it down tightly.

Yes, the special oil filling the case is a permanent feature of the watch's design, intended to enhance the dial's appearance and legibility. It is not meant to be removed.

The Locking Ring System is an innovative mechanism on the case back that allows for quick and easy battery replacement by securing the case back with a ring that can be easily opened and closed, often with a specific tool or technique.

The U-Boat Darkmoon Watch has a water resistance of 50 meters (5 ATM). This rating is suitable for splashes and everyday wear but not for swimming, diving, or prolonged immersion in water.

Clean the vulcanized rubber strap with a soft, damp cloth. Mild soap can be used if necessary, followed by rinsing with clean water and drying thoroughly with a soft cloth. Avoid exposure to solvents or harsh chemicals.

The battery may be depleted. The U-Boat Darkmoon features a Locking Ring System for quick battery replacement. If the issue persists after battery replacement, the movement may require servicing by a professional.

Ensure the dial is clean. The SuperLuminova markers and hands are designed for low-light visibility. For extreme darkness, the oil-filled dial enhances contrast, but the lume has a finite glow duration after being exposed to light.

Ensure the crown is fully unscrewed before attempting to set the time or date. If it remains stiff, do not force it. Seek assistance from a watch technician as there might be debris or a mechanism issue.

This could indicate a breach in water resistance. Remove the watch from any moisture immediately and have it inspected by a professional watch repairer to prevent further damage to the movement and the oil bath.