A modern reissue with a legendary backstory, this model pays tribute to the iconic 1977 “Fujitsubo” diver — inspired by the historic Citizen Challenge Diver that was discovered on an Australian beach in 1983, still running after years adrift in the Pacific Ocean. Its barnacle-covered case became a symbol of durability and earned the nickname “Fujitsubo” (Japanese for barnacle).
Crafted from Citizen’s proprietary Super Titanium™, the watch is exceptionally lightweight at just 70 grams, yet highly scratch-resistant and corrosion-resistant.
Case Diameter: Approx. 41mm
Case Thickness: Approx. 12.3mm
Crystal: Anti-reflective sapphire
Crown: Screw-down crown for enhanced water security
The matte black dial features bold embossed hands and markers filled with vintage-tone green luminous material, delivering excellent legibility with a classic 70s-inspired aesthetic. A unidirectional rotating elapsed-time bezel ensures precise dive timing.
Powered by Automatic Caliber 9051, the watch offers:
42-hour power reserve
Enhanced magnetic resistance (up to 16,000 A/m)
Automatic winding with hacking seconds
ISO-compliant and water-resistant to 200 meters, it is built to meet professional dive standards while remaining versatile enough for daily wear.
The black polyurethane strap features a raised square pattern for comfort and grip, whether worn over a wetsuit or on bare wrist.
A true tool watch with authentic heritage, the NB6021-17E blends proven reliability, lightweight construction, and vintage dive character into a modern everyday companion.