Case size: 40 mm
Case material: Stainless Steel AISI 316L, oil-filled with compensating air bubble
Movement: Swiss Ronda 712.3 Quartz, oil-bath lubricated
Functions: Hours, minutes, screw-down crown
Caseback: Locking Ring System, engraved serial number, quick battery replacement
Dial: Black painted metal with beige Super-LumiNova® hands, numbers, and indexes
Crystal: High-quality curved sapphire
Strap: Black vulcanized rubber, 20/18 mm, quick-release system, U-Boat logo (ref. 3991/Z), steel tongue buckle (ref. 7019/SHINY/MAT)
Water resistance: 50 m / 5 ATM

Equipped with a Swiss Ronda 712.3 quartz movement lubricated in an oil bath, the Dark Moon 40mm guarantees precision and durability. The Locking Ring System ensures fast and simple battery replacement, while the domed sapphire crystal enhances protection. A black vulcanized rubber strap with quick-release fitting completes this versatile and highly legible design.

Watch Care Instructions:

Clean regularly with a soft, dry cloth.

Avoid contact with chemicals, solvents, or perfumes.

Keep away from extreme temperatures and magnetic fields.

Ensure the crown is fully pushed in or screwed down before exposure to water.

Store in a dry, cool place or in a watch box when not in use.