U-Boat Darkmoon Soleil Oil Immersion Men’s Blue Watch

U-Boat Darkmoon Blue PVD Soleil Ref. 8700/E is inspired by the dark side of the moon, combining a bold blue soleil dial with U-Boat’s signature oil immersion technology for intense colour depth and striking visual clarity.

Powered by the Swiss Ronda 762 quartz movement, lubricated in an oil bath, this timepiece delivers precise hours-and-minutes timekeeping while enhancing legibility through its unique oil-filled construction. A visible air bubble compensates for temperature variations, reinforcing the Darkmoon’s technical character.

The 46.5mm stainless steel case with black PVD treatment is completely oil-filled to create the illusion of an absent crystal, protected by a domed sapphire crystal and complemented by a left-positioned crown. Finished with a durable black vulcanised rubber strap featuring a quick-release system and PVD-treated steel buckle, this Darkmoon delivers modern presence with unmistakable U-Boat identity.

Questions & Answers

• What makes the oil immersion design special? The oil-filled case enhances colour intensity and legibility, creating the illusion of no crystal.
• What movement does this watch use? It is powered by the Swiss Ronda 762 quartz movement lubricated in an oil bath.
• Are the details luminous? Yes, the hands and indexes are treated with beige Luminova.
• Is the battery easy to replace? Yes, the locking ring system allows quick battery replacement.
• Is it suitable for daily wear? Yes, its robust case and rubber strap make it ideal for everyday use.