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Sinn, a German watch manufacturer based in Frankfurt am Main, was established in 1961 by Helmut Sinn, a seasoned pilot. Initially focusing on navigation clocks and pilot's chronographs, it also produced watches for Bell & Ross from 1993-2002. Today, Sinn crafts roughly 10,000 watches a year.

A conventional diver's watch's crystal reflects light underwater, impacting visibility. However, a HYDRO watch such as this, is filled with a fluid that shares the sapphire crystal's optical properties, prevents this mirroring effect. This ensures the watch face remains fully readable even from oblique angles, both in and out of the water.

The watch boasts an incredible 5000m water resistance which is largely due to the HYDRO technology pioneered by Sinn.

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