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The first diver's watch with a rotating bezel, the Zodiac Sea Wolf was announced at the Basel Fair together with the Fifty Fathoms from Blancpain in 1953. Both are credited with being the first commercially available diver's watch. However the Zodiac was rated at 10 atmospheres (660 feet) and was more highly rated than the Blancpain 50 fathoms (300 feet).
THE EARLY SEAWOLF - Count down Bezel
The earliest models had an external bidirectional steel bezel, and a pre Sea Wolf prototype model is shown below. This is signed 10 Atm (339 feet) below the Zodiac logo, and name Zodiac, but has a plain screw down case back.
The dial has numerals at 2, 4, 6, 8 and 10 with fluted indices elsewhere. The numerals have been inked over. The bezel is elapsed time, with numerals at 45, 30 and 15. The hands are broad lumed Dauphine shape.
https://thespringbar.com/blogs/guides/t ... c-sea-wolf
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