Rolex

Bill
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There is some history with Doxa and HEV development.

Apparently in 1967 Doxa co developed the HEV with Rolex. They worked side in the waters off Geneva. Rolex was the one who put in the application for a patent hence the pat pend. Doxa commercialized the Conquistador 300T with the HEV late 1968 early 1969. They claim it was the first offer to the general public as all the prototypes developed by Rolex went exclusively to commercial divers / dive companies like Comex. The models from rolex included also the 5513 with hev. I have seen or heard diver comments on early prototypes pre the award of the patent which was going to look up. Rolex also enjoyed various military testing with saturation divers but don't have and supporting pictures for HEV testing. I have a modified / dev version of the Doxa from a seaLab III diver original owner it was dated to 1968/69.

Nice connection for me between these dive watch icons.

Best

Bill