Built for serious underwater performance, the Citizen Eco-Drive Promaster Marine BN1024-01E combines professional-grade functionality with bold, rugged styling. The striking black dial is designed for maximum legibility, paired with a robust silver-tone stainless steel case and durable black polyurethane strap for comfort and reliability in extreme conditions. A unidirectional rotating bezel and clear date display enhance its practicality, making it a dependable companion both in and out of the water. Powered by Citizen’s in-house Calibre E365 Eco-Drive movement, this watch is fuelled by light and offers an impressive 12-month power reserve when fully charged, with an accuracy of ±15 seconds per month. The 46mm stainless steel case delivers a strong wrist presence, while the sapphire crystal provides superior scratch resistance. Engineered as a professional saturation diver’s watch, it features a screw-down crown, helium escape valve, and a secure screw-back case for enhanced durability. With water resistance up to 300 metres, it is built to perform in the most demanding marine environments. - Calibre E365 - 12 Month Power Reserve - Accuracy ±15 seconds per month - 46mm case Size - Stainless Steel Case - Polyurethane Strap - Sapphire Crystal - Date Display - Screen Back Case - Screw Down Crown - One-way elapsed time rotating bezel - 300 Meters Water Resistant