Inspired by a rare prototype timepiece from 1967, the Doxa Sub 300 Black Lung Watch sports a vintage design that would make longtime fan Jacques Cousteau proud. Its dial is finished in the company's signature "professional" orange, with a date window at 3 o'clock and the "aqua-lung" logo at 8. It's powered by a chronometer-grade ETA movement, which sits inside the 42.5mm case crafted from a solid block of stainless steel. Also notable are the serrated, unidirectional timing bezel with "no deco" scale and stainless rice bead bracelet. Limited to just 300 pieces.