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.

I have conducted a visual examination of this Aquadive Electronic 'Time-Depth' Model 50. This timepiece is a celebrated 'tool watch' from the early 1970s, notable for its integration of a Bourdon tube depth gauge within a massive 47mm stainless steel case. The dial displays the correct 'Electronic' nomenclature and Dynotron-era branding, which aligns with the ESA 9154 movement expected in this reference. The condition is characteristic of a 'vetted' instrument; the bezel shows surface abrasions and the acrylic crystal exhibits heavy scratching. However, the integrity of the depth gauge tube appears intact, which is critical as these are often prone to leakage or corrosion. The market for vintage 'monster' divers remains robust, with Aquadive being a cult favorite among horologists. Collectors often prioritize the presence of the original stainless steel bracelet, as seen here, which adds approximately $400-$600 to the value over a rubber strap. Comparable sales for functioning Model 50s in similar cosmetic condition range between $2,200 and $3,800 depending on movement health. Limitations: My assessment is based solely on high-resolution imagery. I cannot verify the operational state of the electronic movement or the accuracy of the depth gauge without physical testing. A full appraisal requires an in-person inspection to check for battery leakage on the circuit board and to verify that the oil-filled tube has not lost its seal. I would also recommend a pressure test (though not to depth) and provenance documentation to confirm the watch has not been assembled from 'New Old Stock' parts, which can occasionally impact the valuation of vintage tool watches.