The Citizen Eco-Drive Promaster Marine BN0261-51E is a rugged yet refined diver’s watch, built to ISO standards and designed for both professional use and everyday wear. Featuring a 40mm stainless steel case, black unidirectional rotating bezel, and a bold black dial, this timepiece offers superb underwater readability and reliable functionality. Powered by Citizen’s Eco-Drive technology, it harnesses light to keep running—eliminating the need for battery replacements. Its versatile design and durable construction make it equally suited for ocean dives or urban life. - Calibre E168 - Accuracy: ±15 seconds per month - 40mm Case Size - Stainless Steel Case and Bracelet - Sapphire Crystal - Date Display - Screw-Back Case - Screw Down Crown - One-way elapsed time rotating bezel - Luminous Hands - 200 Meters Water Resistant