The U-Boat Darkmoon 25° SS Green Soleil celebrates the brand’s 25th anniversary in an edition limited to 300 watches, with a commemorative plaque at 6 o’clock.
Immersed in oil
Oil surrounds the dial and the Swiss Ronda 762 quartz movement, making the dial’s color look deeper and the domed sapphire crystal seem to disappear. A visible air bubble leaves room for the oil to expand or contract as the temperature changes. When the watch is off your wrist, U-Boat specifies a temperature range of 32–140°F (0–60°C).
A 25th-anniversary dial
Applied numerals and hour markers stand above the green metal dial. Sunray brushing shifts the reflections across the surface as the angle of the light changes. Beige Super-LumiNova coats the hands and dial details. The anniversary logo appears alongside the plaque.
Rooted in a 1942 naval design
The left-side crown comes from Ilvo Fontana’s 1942 plans for an Italian Navy watch that was never built. His grandson Italo revived the design in Lucca. On the Darkmoon, the screw-down crown sits beneath a guard.
The details
The 46.5 mm case is 316L stainless steel and water-resistant to 50 meters. 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 attaches with a quick-release system. It tapers from 22 mm at the lugs to 20 mm at the stainless steel pin buckle. The watch is made in Italy.
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 green surface reflects light.
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