For sale is a 1970s Aquadive time depth 50 dive watch. The watch has the classic black gray dial with red numbering and orange depth gauge hand. The adjustable bezel is in mint condition.The watch is in flawless shape is in mint condition. No scratches or flaws to the entire 46mm wide case and absolutely zero blemishes to the dial. The only flaw being missing lume on the minutes hand. Overall, this watch looks to have never even been worn.The Aquadive also has ‘US Patent No.337 78 60’ engraved in the caseback.The watch comes on the original Aquadive rubber bracelet as well, also in mint condition.The watch is functionally perfectly and features an electronic movement, which was just replace with a new battery. The Model 50 is powered by an electronic movement supplied by ESA and is badged with the ‘NAC inc’ brand on the battery cover. For those unfamiliar with the movement technology in this watch, the ESA 1954 is not quartz or a tuning fork. Instead this is an electronic movement that draws power from a battery and uses it to energise a balance wheel, in the same manner as the stored energy of the mainspring does in a purely mechanical watch.Please let me know of any questions on this beautiful piece.