Blancpain Fifty Fathoms Bathyscaphe Ceramic — Tropical Green Flyback Chronograph | Ref. 5200 0153 NABA

When Blancpain introduced the original Fifty Fathoms in 1953, it redefined what a professional diving instrument could be — setting benchmarks that would influence an entire generation of tool watches. Established in 1735 as the world's oldest watch manufacturer, the Manufacture brought the same exacting standards to the deep sea that it had long applied to its dress and grand complication timepieces. The Fifty Fathoms Bathyscaphe is the modern heir to that legacy: uncompromising in performance, yet refined enough to transcend its professional origins.

Powering this flyback chronograph is Calibre F385, an automatic movement that places the rapid-reset flyback function at the disposal of divers and sports timing enthusiasts alike. The elimination of repetitive hand-resetting operations makes split-time measurement both swifter and more reliable under pressure. The 43.6 mm case is crafted entirely from satin-brushed black ceramic — a material chosen for its scratch resistance, hypoallergenic properties, and featherweight comfort on the wrist. The unidirectional bezel features a ceramic insert with Liquidmetal hour-markers, precisely indexed and impervious to the corrosive effects of prolonged submersion. Water resistance extends to an impressive 30 bar.

The tropical green dial — a rare colourway in the Fifty Fathoms family — lends this reference exceptional visual presence, evoking the luminous tones of shallow tropical waters. Paired with a black NATO fabric strap and pin buckle, the configuration is built for active wear without sacrificing the character expected of a Blancpain. For collectors drawn to the intersection of haute horlogerie and genuine technical purpose, this piece occupies a compelling position in the contemporary sports-watch canon.