A Seiko Marinemaster 'Tuna' Spring Drive Watch. Ref SBDB013. Circa 2016. Bright Titanium Case Material with DLC (Diamond-like-Carbon) Hard Coating 49 mm. Bright Titanium Unidirectional Rotating Bezel Sapphire glass with anti-reflective treatment, automatic calibre 5R65 30 Jeweled Spring Drive movement (±1 Second Day-to-Day) Accuracy, black dial with Strong Lumibrite markers and hands, date window at four o'clock and power reserve indication. Silicone divers strap with tang style pin buckle. Box and paperwork.