U-Boat Darkmoon 25° PVD Blue Soleil marks the brand’s 25th anniversary with an oil-filled dial and a commemorative plaque at 6 o’clock.
The anniversary logo and plaque at 6 o’clock mark 25 years of U-Boat, with production limited to 300 watches for this reference. Applied numerals and hour markers rise above the blue metal dial, where sunray brushing changes the reflections as the light moves. Beige Super-LumiNova highlights the hands and dial details.
Inside the 46.5 mm 316L stainless steel case with its black PVD finish, oil surrounds the dial and Swiss Ronda 762 quartz movement. It deepens the color and gives the impression that the domed sapphire above the dial has disappeared. A visible air bubble allows for temperature-related changes in the oil’s volume. The screw-down crown sits beneath a guard on the left.
A laser-engraved serial number and QR code mark the back, which uses U-Boat’s Locking Ring System for battery access. The black vulcanized rubber strap has a raised U-Boat logo and a quick-release attachment at the lugs. It narrows from 22 mm at the watch to 20 mm at the PVD-coated 316L stainless steel pin buckle. Water resistance is rated at 5 atm, and U-Boat specifies 0–60 °C when the watch is off your wrist.
The bubble is an intentional part of the oil-filled construction. It leaves room for the oil to change volume with temperature and moves as the watch changes position.
It combines the 25th Anniversary U-Boat logo with a commemorative plaque at 6 o’clock and applied dial details. This reference is limited to 300 watches.
It has U-Boat’s quick-release system, which replaces the screw-secured attachment used on earlier versions. The strap measures 22 mm at the watch and narrows to 20 mm at the buckle.
Soleil refers to the dial’s sunray brushing. Fine lines spread outward across the metal, changing the way its blue surface reflects light.
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