U-Boat Darkmoon 40 Oil Immersion Men’s Green Watch

U-Boat Darkmoon 40 Ref. 9503/A brings colour and innovation together through U-Boat’s distinctive oil immersion technology, delivering a striking visual experience on the wrist with a vibrant green soleil dial that gradually fades into deep black.

Driven by the Swiss Ronda 762 quartz movement, lubricated in an oil bath, this model offers precise and reliable timekeeping with a minimalist display of hours and minutes. A visible air bubble compensates for temperature variations, highlighting the watch’s unique engineering and optical depth.

The 40mm stainless steel case with PVD treatment is fully oil-filled to enhance legibility and create the illusion of an absent crystal, complemented by a left-positioned crown for added character. Finished with a durable black vulcanised rubber strap and PVD-treated steel buckle, the Darkmoon Green Soleil delivers modern design with unmistakable U-Boat identity.

Questions & Answers

• What makes the oil immersion design special? The oil-filled case enhances depth and legibility, creating the illusion of no crystal.
• What movement powers this watch? It uses a Swiss Ronda 762 quartz movement lubricated in an oil bath.
• Is the dial luminous? Yes, the hands, numbers, 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 everyday wear? Yes, its robust construction and rubber strap make it ideal for daily use.