RESERVOIR Hydrosphere Blackfin: the dive watch inspired by a pressure gauge
In the world of dive watches, legibility generally relies on a tried-and-tested formula: three central hands, a rotating bezel, and highly luminescent markers. With the Hydrosphere Blackfin, RESERVOIR takes a significantly different approach. The French watchmaker brings to the wrist the look of analog instruments used by divers, and more specifically, that of a pressure gauge. This inspiration isn't limited to the dial design. It also dictates how the time is read. A large hand travels an arc before instantly returning to its starting point, while the hours appear in a window. This unusual architecture for a dive watch is combined with a 45mm steel case, a helium escape valve, and a water resistance rating of 250 meters. It is available starting at €5,400.
The diving gauge as a starting point
RESERVOIR has built part of its identity around measuring instruments. Automotive gauges, aeronautical instrumentation, and marine equipment thus become aesthetic references for its various collections. With the Hydrosphere, the inspiration comes directly from scuba diving. The dial adopts the visual layout of a pressure gauge, an instrument that allows divers to monitor the pressure in their tanks. RESERVOIR acknowledges this lineage and presents the Hydrosphere as a horological interpretation of these essential instruments for managing a dive. On the Blackfin, this influence is immediately apparent. The black dial features large white numerals arranged in an arc and several colored zones. The overall design favors a highly instrumental aesthetic, far removed from the classic design of a traditional diver's watch.
A single hand to display the minutes
The most noticeable feature of the Hydrosphere Blackfin is its display. The large central hand indicates not the hours but the retrograde minutes. It advances throughout the hour before returning to its starting point when 60 minutes are reached. The hour is displayed separately in a jumping hour aperture, topped with a magnifying lens for improved readability. At the change of the hour, the numeral flips instantly while the minute hand begins its journey anew. This design allows RESERVOIR to recreate the characteristic movement of a manometer hand while retaining the display of hours and minutes. Reading the time therefore requires a short period of adjustment. It is also one of the watch's key identifying features.
An additional running indicator
Another detail completes the design: a running indicator located at the base of the hand. This rotates clockwise, allowing for visual verification that the movement is functioning. RESERVOIR integrates it with the various elements that give the dial its instrument-like appearance. The white hour markers are coated with Super-LumiNova to maintain their visibility in low light. The dial is protected by a sapphire crystal with an anti-reflective coating.
An imposing 45mm steel case
A watch inspired by diving equipment could hardly adopt particularly discreet proportions. The Hydrosphere Blackfin measures 45mm in diameter. Its case is made of 316L stainless steel with a satin finish. The case back and crown are screw-down. These dimensions clearly place the model among watches with a significant presence on the wrist. They also correspond to the legibility objective sought by the collection. RESERVOIR announces a water resistance of 250 meters, or 25 bar, and equips the Blackfin with a helium escape valve. This valve is designed for saturation diving situations, allowing the evacuation of helium that could enter the case.
Discover the complete specifications of the Hydrosphere Blackfin TANK
A special bezel to accompany the retrograde minutes
The rotating bezel constitutes an essential element of a traditional diving watch since it makes it possible to monitor an immersion time. But the retrograde display of the Hydrosphere poses a particular problem: after 60 minutes, the needle suddenly returns to zero. RESERVOIR has therefore developed a unidirectional ceramic bezel with double graduation. Its organization allows the time to be read according to the position of the hand, both before and after its retrograde return. This is probably one of the most interesting technical details of the Hydrosphere. The bezel was not simply added to respect the aesthetic codes of the diver: its graduation had to be adapted to the specific display system of the watch.
A proprietary module of 124 components
Inside this first generation of Hydrosphere Blackfin, RESERVOIR uses a Swiss ETA 2824 mechanical base with automatic winding. However, the manufacture associates it with its own module of 124 components, necessary to ensure the three characteristic functions of the watch: retrograde minutes, jumping hours and power reserve indication. The movement operates at a frequency of 28,800 vibrations per hour. Its power reserve is announced at 37 hours. This architecture therefore makes it possible to start from a known Swiss automatic caliber while offering a display which strongly differentiates the Hydrosphere from a conventional mechanical diver.
Steel or rubber strap
The Blackfin is fitted as standard on a brushed 316L steel bracelet, directly screwed to the case. Its folding clasp incorporates an extension system, particularly useful for adapting the bracelet when the watch is worn with certain diving equipment. RESERVOIR also provides an additional black rubber strap, which significantly modifies the appearance of the watch while remaining consistent with its aquatic vocation. The presentation continues this logic since the Hydrosphere Blackfin is delivered in a waterproof container more reminiscent of technical equipment than a traditional watch box.
A diver noticed at the GPHG
The originality of this architecture has also earned the Hydrosphere recognition in the watchmaking community. The Blackfin was notably named in the Diving Watch category of the 2019 Geneva Watchmaking Grand Prix, a distinction that RESERVOIR recalls in its presentation of the model. This nomination underlines the singularity of the proposal: rather than revisiting a historic diver, RESERVOIR sought to build its model around another instrument truly associated with the underwater universe.
A dive watch unlike any other: RESERVOIR Hydrosphere Blackfin
The Hydrosphere Blackfin doesn't simply try to compete with traditional dive watches on the grounds of neo-retro design. Its appeal lies primarily in how RESERVOIR has transposed underwater instrumentation into a mechanical construction: a retrograde minute hand, jumping hour, running indicator, and double-graduated bezel form a coherent whole, evoking the concept of a pressure gauge. The rest of the specifications, however, firmly place the watch in the world of true dive watches: 316L stainless steel, sapphire crystal, unidirectional ceramic bezel, screw-down crown, helium escape valve, and water resistance to 250 meters. With its 45mm diameter and atypical display, the Blackfin isn't a watch that seeks discretion. Rather, it offers an instrumental and mechanical interpretation of the dive watch, where originality stems not only from the dial but also from the very way time is displayed.
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Editor: Éric Barse
Journalist, entrepreneur, and founder of the websites www.cafe-racer-only.com and www.scooter-3-roues.com, Eric Barse divides his time between his passions: motorcycles, travel, and watches. A graduate of the Saint-Cyr military academy and the 2nd RPIMA (Parachute Regiment) before pursuing a career in communications and digital media, he has a true passion for authentic watches that have accompanied his two-wheeled adventures for many years, from the Indian Ocean to Africa and Latin America!
