U-Boat Darkmoon Oil Immersion Men’s Aquamarine Watch

U-Boat Darkmoon BK Curve Aquamarine Ref. 9526/B brings the dramatic “oil immersion” concept to a bold 46.5mm format, combining a deep black aesthetic with striking aquamarine luminous accents for powerful visual contrast.

Powered by the Swiss Ronda 762 quartz movement, lubricated in an oil bath, this electromechanical timepiece delivers precise hours-and-minutes timekeeping. The oil-filled case creates the illusion of an absent crystal, enhancing depth and legibility, while a visible air bubble compensates for temperature variations.

The black PVD-treated stainless steel case is paired with a curved sapphire crystal and a distinctive left-positioned crown. Finished with an ultra-resistant aquamarine rubber strap featuring a quick-release system and PVD-treated steel buckle, this Darkmoon offers bold presence and unmistakable U-Boat identity.

Questions & Answers

• What is oil immersion technology? The case is filled with special oil to enhance depth and legibility, creating the illusion of no crystal.
• What movement does this watch use? It uses the Swiss Ronda 762 quartz movement lubricated in an oil bath.
• Are the details luminous? Yes, hands, numerals, and indexes are treated with aquamarine Superluminova.
• Is the battery easy to replace? Yes, the locking ring system allows quick battery replacement.
• Is it suitable for daily wear? Yes, its robust construction and rubber strap make it ideal for everyday use.