I've never seen one "in the wild." I don't know a single diver that would use such a watch as a dive instrument. Before dive computers (mid 80s?), we had dedicated (and more importantly... accurate) dedicated depth gauges. Since your very life (or at least health) depends on accurate depth awareness, I cannot imagine depending on a novelty depth gauge built into a watch.There are many Citizen dive watches over the years that have a depth gauge, both analog and ana-digi (not sure about digital).