Vintage Aquadive Electronic Time-Depth Model 50 Diver's Watch

This is a vintage Aquadive 'Time-Depth' Electronic dive watch, a significant piece of horological history from the early 1970s. The watch features a substantial stainless steel cushion-shaped case with integrated lugs, typical of the technical dive watch styles of that era. Its primary distinguishing feature is the built-in mechanical oil-filled Bourdon tube depth gauge, which is indicated by the orange hand pointing to the circular depth scale (0 to 200 feet) on the dial. The dial itself is black with blue accents, featuring the 'Aquadive' and 'Electronic' text, along with a logo at the 6 o'clock position. It has a blue and silver rotating bezel with a luminous triangle at the 12 o'clock/60-minute marker. This specific model used an ESA 9154 Dynotron electronic movement, merging mechanical bridges with battery-powered electronics. The watch is presented on a period-correct stainless steel link bracelet. Condition-wise, it shows significant signs of wear consistent with a working tool watch: there are numerous scratches on the crystal and metal case, and the blue bezel insert exhibits surface scuffs and minor loss of finish. The 'Swiss Made' mark is visible at the bottom of the dial. This item is highly sought after by collectors for its large 'monster' proportions and the unique combination of electronic timekeeping with a mechanical depth measurement system.