Doxa

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# First Orange Faced dive watch, Sub300t in 1967.
# First watch with a rotating bezel to compute no-decompression times, Sub 300t, 1967
# First Publicly Available Dive Watch with Helium Release Valve named the Conquistador.In certain diving situations, helium can penetrate the watch seals and cause a pressure buildup in the watch, eventually blowing the crystal off the watch face. Rolex, invented and introduced the first dive watches with a helium release valve in 1969, which prevented this helium buildup. While this was a major advance at the time, few actual watches with this feature were produced. Doxa introduced the Sub300t Conquistador in 1969 featuring a helium release valve. According to the sales brochures and advertisements in Skin diver magazine, DOXA was the first watch company to introduce this device to the public for general sale.

http://www.doxawatches.com

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