U-Boat U-65 3355 44 mm Black PVD Quartz Watch

Hypercurve Design and Oil-Filled Dial

The U-Boat U-65 3355 is a 44 mm sports watch built for men who want a distinctive wrist presence. Its black PVD-coated stainless steel case houses a black skeletonised metal dial with three stacked levels. The dial is filled with a special oil that amplifies colour and legibility while creating the illusion of a missing crystal. A visible air bubble compensates for temperature changes.

Sustained Legibility and Caseback Adjustment

Under continuous wear the oil bath maintains consistent clarity across the dial, avoiding the fogging or condensation that can affect conventional crystals over time. White Super-LumiNova on the arrow hands and Arabic numerals at 4 and 8 o'clock provides lasting low-light readability. Time is set via a discreet button centred on the solid caseback rather than a traditional crown, so the hyper-rounded profile remains uninterrupted during daily use.

Ronda 756 Quartz Movement and Water Resistance

The watch runs on a Swiss Ronda caliber 756 quartz movement lubricated by an oil bath, accessed through a quick battery replacement hatch beneath a patented locking system. Water resistance is rated to 50 m or 165 feet, suitable for surface swimming but not for diving or high-pressure water sports. The black silicone strap measures 22 mm wide and fastens with a black PVD-coated steel signed buckle on mobile lugs that follow the wrist's natural curve.