If you look at the Aegir line designed by a commercial diver the describe their CD-1 as such:
"The Ægir CD-1 ( Concept Diver 1 ) was designed as a commercial divers watch, where the diver does not need to know his bottom time, as most bell runs are in the 4 to 8 hour range.
This watch was in fact designed while sitting in the dive bell and the principal behind it was the (one watch) concept.
Would be equally at home over a dive suit, as it would be under a business suit."
Now well that may not be the definitive, and notwithstanding the requirements of ISO 6425, considering that the rotating bezel timing device was invented specifically for measuring of bottom time and decomp. and ascent rates for SCUBA users, it isn't really reasonable to dismiss a watch as not being a serious diving watch merely due to the absence of an elapsed time measuring device that would anyway be superfluous to the needs of a commercial diver whose timing is controlled to the second from topside crew. Not good as a diving watch for a SCUBA user certainly but then again they'll be using a dive computer and most likely wear a watch only if they are a dive watch enthusiast or maybe for "backup".
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