Citizen Promaster x Mechanical ft. Fujitsubo Men Casual Formal Round Diver 200m Water Resistant Watch NB6021-17E NB6021 NB-6021 Introducing the Promaster Mechanical Diver, a modern reinterpretation of a classic 1970s diving watch inspired by an Australian beach find. Nicknamed Fujitsubo, it features a bold black dial, embossed hands, and vintage green illumination. Made from lightweight Super Titanium, it includes a rotating bezel, anti-reflective sapphire crystal, and a black polyurethane strap. With a 42-hour power reserve, enhanced magnetic resistance, and ISO compliance, this water-resistant watch combines heritage and innovation. Caliber Number / Movement 9051 (automatic with manual winding capacity) Power Reserve / Accuracy Approximately 42 hours (+20 to -10 seconds per day) Crystal Sapphire crystal Luminous Luminous on hands, indexes and bezel Case / Band Material Titanium case (Duratect DLC) with polyurethane rubber strap Water Resistance 200m / 660ft diver Case Size Thickness: 12.3 mm Diameter: 41.0 mm Other Specifications Citizen Promaster x Mechanical ft. Fujitsubo Magnetic resistance (16,000 A/m) Unidirectional rotating bezel Screw-down crown Screw case back 24 jewels Date display Stop second hand function (hacking mechanism) Regular timekeeping (analog display)