![]() ![]() Navy, NASA and the American Department of the Interior in collaboration with the General Electric Company, four aquanauts spent 60 days in an underwater habitat 15 meters below sea level. Tektite I was a federal underwater experiment that took place from February 15 to Apin the Lameshur Bay of St. The 500M model can be found in other pictures as well. In the picture below taken from a Life magazine article on the Tektite I experiment, the Super PH 500M can be recognized on the diver’s wrist. ![]() Furthermore, the Super PH 1000M was introduced as the successor of the 500M model in the same article. The article on the right, from Certina’s own magazine “Certina Echo” (spring edition 1970) is proof against this rumour. Unfortunately, erroneous information was spread by some sources that the 1000M version (Reference 5801 302) was used in the Tektite I experiment. Furthermore, there is evidence that Certina had already provided watches for the earlier US Navy experiment called Sealab II. The DS-2 Super PH 500M was successfully used in the TEKTITE I & II experiments in 19. When the successor to the DS (the DS-2) was launched in 1968, two versions were available: one was waterproof down to 200m (reference 5801 303), the other waterproof down to 500m (reference 5801 123). The first diver’s models came on the market around 1960, shortly after the introduction of the DS product line (1959). ![]()
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