Aquastar Benthos 500

I guess you can call this unique. This watch was made in the 1960's made by Aquastar the Benthos 500 with a 60 minute dive counter that I have not seen on any other watch. You press the pusher the dive counter the orange hand moves from the twelve backwards back to the twelve and then moves forward for 60 minutes until it stops at the twelve I guess how the movement is made the gears of the minute hand and the orange hand match up and the minute hand pulls the orange hand along is about the easy way of explaining it.