Mido Ocean Star Decompression Timer
Produced from the late 1950s and officially launched in 1961, this timepiece dedicated to underwater pursuits is a valuable tool for divers, thanks to the multicoloured display of the decompression stages on its dial and its rotating bezel. It can also be found under other names, such as Ocean Star Rainbow Diver or Ocean Star Powerwind 1000.
In a real-life deep diving situation, the watch shows the diver whether a decompression period has to be observed when reascending, and specifying the duration of each stage. This feature, which was an incredible innovation at the time, was the result of in-depth research undertaken in conjunction with renowned divers from across the world.