Nivada Depthomatic 57023

Nivada Grenchen Depthomatic

Rare professional diving watch with depth gauge, Ref. 57023, circa 1967 watch case: stainless steel, number 3441, screw-down back, 2 crowns, plastic tube for depth gauge, blackened bezel with depth indication in meters, diameter approx. 43 mm movement: Automatic, anchor movement, base caliber ETA 2472, 21 jewels dial: Black, Arabic numerals, luminous markers, rotating and externally adjustable diving time ring, date, central seconds When it was launched in 1964, the Dephtomatic from Nivada was the first wristwatch with an integrated depth gauge. Depending on the diving depth and the corresponding pressure, the transparent plastic tube built between the watch glass and the bezel filled with water via an opening, compressing the air in the tube and allowing the diving depth to be read on the bezel via the level. From a private collection. Bezel renewed, case with pressure marks.