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

U-Boat Darkmoon 40 Ref. 9545 captures the allure of total black, combining minimalist design with advanced technical innovation. This striking 40mm timepiece features U-Boat’s signature oil immersion technology, creating the illusion of an absent crystal and delivering exceptional depth and legibility.

Powered by the Swiss Ronda 762 quartz movement, lubricated in an oil bath, the Darkmoon offers precise and reliable timekeeping with hours and minutes displayed in their purest form. A visible air bubble compensates for temperature changes, highlighting the watch’s distinctive engineering.

The 40mm stainless steel case with black PVD treatment is completely oil-filled and protected by a left-positioned crown guard, while a curved sapphire crystal enhances the deep black dial finished with grey Superluminova details. Completed with a durable black vulcanised rubber strap and PVD-treated steel buckle, the Darkmoon delivers bold presence and unmistakable U-Boat identity.

Questions & Answers

• What is oil immersion technology? The case is filled with special oil to enhance dial 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 battery easy to replace? Yes, the locking ring system allows quick battery replacement.
• Does it feature luminous details? Yes, indexes and hands are treated with grey Superluminova.
• Is it suitable for everyday wear? Yes, its robust construction and rubber strap make it ideal for daily use.