ZRC Grands Fonds Q157-Phenix: owner reviews and feedback

The ZRC Grands Fonds Q157-Phenix, launched in 2024, is a 200-piece limited edition of the Grands Fonds MN64 1000M created for ZRC’s 120th anniversary and linked to a memorial project dedicated to the French submarine Phénix Q157, lost on 15 June 1939 off Cam Ranh in present-day Vietnam. More than a simple colour variation, reference GF42168PH combines the particularly radical technical architecture of the MN64 with a specifically developed sunray-blue dial intended to evoke reflections from the surface of the sea and light descending towards the depths. Its monobloc 316L steel case measures 41.5 mm, its crown is positioned at 6 o’clock, water resistance is guaranteed to 1,000 metres and every watch is tested to 1,500 metres. It uses an Elaboré-grade Sellita SW300-1 with 56 hours of power reserve and is delivered in a special presentation set containing several elements recalling the Phénix submarine.

Design & legibility: blue as a direct evocation of the depths

The dial is the most immediately visible distinction from other MN64 variations. ZRC chooses a sunray blue whose reflections change significantly according to the orientation of the watch and surrounding light. The surface can appear almost marine-black from certain angles and substantially brighter when direct light reaches the dial. ZRC explains that this finish was developed to reproduce both reflections from the sea and rays of sunlight progressively penetrating the depths. The aesthetic justification is particularly coherent with the history of the Phénix and gives the watch a less strictly military personality than certain black Grands Fonds models.

The broad flange surrounding the dial further increases this sensation of depth. It creates a significant transition between the central surface and sapphire crystal, making the hands appear to operate at the bottom of a structure deeper than the external case dimensions might suggest. Applied markers stand clearly above the blue surface. The multi-level construction prevents the sunray dial from turning the watch into a merely decorative diver. Its organisation remains fundamentally that of an instrument whose principal information must be recognised instantly.

The so-called Magnum hands are substantial and filled with luminous material. Their shape clearly differentiates hours from minutes while central seconds allow the operation of the movement to be checked visually. Hour markers are likewise highly luminous. The deliberately oversized hands and indexes directly address the requirement for immediate readability on a professional diving watch. This remains one of the strongest characteristics of the Grands Fonds regardless of the commemorative dimension of this edition.

The unidirectional bezel uses a blue ceramic insert whose tone also changes significantly with the light. Its sixty-minute graduation can be used to monitor dive time or any other interval without a chronograph. Counter-clockwise-only rotation follows traditional diving-watch safety logic. An accidental movement of the bezel can theoretically only reduce the remaining displayed time rather than suggest that additional time is available. The scale therefore retains a genuinely instrumental purpose despite the more precious character of ceramic.

The blue of the dial and bezel are not necessarily intended to produce one uniform shade. Their different materials and reactions to light instead create a range extending from almost black deep blue to much brighter tones. This variation allows the Q157-Phenix to evoke simultaneously the bright surface of the sea and the substantially darker environment below. It strongly distinguishes the edition from MN64 references with a more military or purely technical aesthetic.

The case nevertheless retains a predominantly satin-brushed finish. ZRC therefore avoids multiplying polished surfaces that could distract from the dial or turn the watch into an excessively luxurious object. The contrast between functional steel and the sunray-blue dial allows the commemorative edition to remain a genuine tool watch. This restraint matters for a watch whose story is based as much on real diving as on commemoration.

Case, crown and diving systems: an MN64 engineered for 1,000 metres

The monobloc case is manufactured from non-magnetic 316L stainless steel and measures 41.5 mm in diameter. ZRC states compliance with ISO 764 for magnetic resistance to 4,800 A/m. Construction remains comparatively compact given the pressure capability. The 41.5 mm diameter allows the Q157-Phenix to retain substantial presence without reaching the dimensions of many extreme divers above 44 or 45 mm. The specific geometry of the case and position of the crown nevertheless influence wrist feel more strongly than the diameter figure alone.

The crown is located at 6 o’clock between the two sections of the strap, an arrangement directly inherited from the Grands Fonds developed for the French Navy during the 1960s. Its position prevents it from pressing into the back of the hand and provides natural protection. The 6 o’clock crown is the most immediately recognisable architectural feature of the Grands Fonds. It also requires a case and strap construction fundamentally different from a conventional diving watch with its crown at 3 or 4 o’clock.

The Crown Protection System™ uses this position functionally. Until the crown is completely screwed down, the strap architecture theoretically prevents the watch from being closed correctly around the wrist. The wearer is therefore mechanically encouraged to verify the crown before immersion. The system transforms a potential operational error into a situation that can physically be detected before the watch enters the water. This principle is especially relevant on a watch conceived as professional equipment.

The crown uses an inverted screw thread and dual sealing system. Its operation can therefore initially surprise someone accustomed to conventional screw-down crowns. The ergonomics of the Grands Fonds require a short learning period but soon become a natural part of putting the watch on. The purpose is not to complicate use but to link water-resistance security directly with the closing gesture.

The bezel incorporates the patented ECS®, or Easy Clean System. Channels allow fresh water to circulate underneath the bezel in order to remove salt, sand and other particles that can accumulate following immersion. The ECS directly addresses a real problem affecting diving watches regularly used in seawater: salt crystallisation between bezel and case. Rinsing after a dive can therefore clean areas that would normally be difficult to reach without disassembly.

The crystal is 3 mm thick sapphire with anti-reflective treatment. Its thickness contributes directly to high-pressure resistance and the substantial visual character of the construction. The caseback is screwed down and the watch is guaranteed to 1,000 metres, with each example tested to 1,500 metres. The margin between guaranteed depth and test depth clearly illustrates the safety reserve sought by ZRC. These capabilities naturally exceed the requirements of conventional recreational diving by a very large margin.

Extreme water resistance does not result in an externally visible helium valve on this architecture. ZRC instead prioritises case construction, seals and proprietary systems rather than adding another control to the side of the watch. The Q157-Phenix therefore differs from many contemporary professional divers that incorporate an additional helium-release valve. Its philosophy remains that of a compact case in which technical solutions are integrated as discreetly as possible.

Movement: Elaboré Sellita SW300-1, 4 Hz and 56 hours

The Q157-Phenix uses the automatic Sellita SW300-1 in Elaboré grade. This comparatively slim Swiss calibre allows ZRC to maintain a compact architecture despite substantial pressure resistance. It operates at 28,800 vibrations per hour, or 4 Hz, and displays hours, minutes and central seconds without adding another complication to the dial. The choice of the SW300-1 prioritises a proven, slim mechanism familiar to servicing workshops rather than an exclusive calibre that could become difficult to maintain. This philosophy is entirely consistent with a watch conceived as a robust tool.

Power reserve reaches 56 hours on the version used by ZRC. This covers a little more than two full days and represents a useful progression from older automatic movements often limited to around forty hours. The 56-hour reserve allows the watch to be removed for an entire day without necessarily requiring resetting the following morning. For someone rotating several watches over a full weekend, however, it remains less autonomous than contemporary movements exceeding 70 hours.

ZRC communicates regulation biased towards a slight gain. The stated target is +5 seconds per day, with a maximum range presented from zero to +10 seconds per day around the intended setting. This philosophy is logical for a tool watch because a slight gain is generally preferable to losing time when timing has practical importance. The accuracy communicated by ZRC should therefore be understood as a functional specification rather than an attempt to advertise exceptional chronometric performance. Actual rate naturally depends on position and individual watch.

The movement uses Incabloc shock protection on the balance staff. ZRC also highlights a locked micrometric regulator intended to limit movement of the setting during sporting use. These choices are principally intended to maintain rate stability when the watch experiences shocks, vibration and substantial movement. They fit the MN64 philosophy better than extensive decoration intended for display through a transparent caseback.

ZRC has also worked with Sellita on the oscillating mass and its balance. The rotor remains invisible because the watch uses a solid back, but its operation contributes directly to automatic-winding efficiency. The movement is not presented as an aesthetic spectacle but as a technical component serving autonomy and reliability. The closed back also preserves the coherent visual treatment of the commemorative watch.

The absence of a date simplifies both the dial and operation. If a Q157-Phenix stops after several days, the owner only needs to wind the movement and reset the time without dealing with a calendar. This functional simplicity is entirely coherent with a diver in which every visible piece of information should have an immediate purpose. It also avoids a window interrupting an hour marker or disrupting the balance of the blue dial.

The Phénix Q157: when submarine history becomes part of the watch

Phénix was a French long-range submarine built in Nantes by Chantiers Dubigeon during the late 1920s. It belonged to the large family of French 1,500-ton submarines developed between the wars and entered service during the early 1930s. In 1939, it was operating in French Indochina alongside the submarine L’Espoir. On 15 June 1939, Phénix disappeared during a naval exercise off Cam Ranh and its entire crew was lost. The loss became one of the significant French submarine disasters immediately preceding the Second World War.

The precise circumstances of the sinking remained difficult to establish. The submarine dived during an exercise involving a simulated naval attack and failed to return to the surface. Contemporary searches located a wreck attributed to Phénix in deep water off Cam Ranh, but conditions and available technology prevented an investigation comparable with modern underwater exploration. This remaining element of uncertainty is precisely what the contemporary expedition supported by ZRC seeks to examine. The project consequently carries a historical and documentary dimension extending beyond a simple marketing narrative.

In 2024, during ZRC’s 120th anniversary year, the company became a partner in a memorial initiative called “La Voix du Souvenir” centred on Phénix Q157. Its stated objective is to contribute to research and documentation around the lost submarine through teams capable of operating in demanding underwater conditions. The watch is conceived as a material extension of this expedition rather than a commemorative edition disconnected from field activity. This relationship explains the use of the MN64 1000M, one of ZRC’s most technically extreme diving platforms at the time.

The choice of Phénix also creates symbolism for the brand’s 120th anniversary. The name naturally evokes the mythological bird associated with disappearance and rebirth. This theme resonates with the history of ZRC itself, founded in 1904 and later revived decades after historical watch production had ceased. The Phénix theme therefore creates a parallel between naval memory, the rebirth of the brand and continuity of the Grands Fonds concept. The watch is not simply an existing dial carrying a military name.

Caseback and presentation set reinforce the connection. The watch is delivered in a dedicated case that notably includes a 1/750-scale reproduction of the submarine, a miniature version of its naval badge, a strap-changing tool and a watchmaker’s loupe. An additional leather strap is also included in certain marketed sets. The presentation set clearly forms part of the collectible proposition and materialises the Q157 story beyond the watch itself. On the secondary market, completeness will therefore matter more than it would for a standard MN64.

On the secondary market, completeness of the presentation set has particular importance. Submarine replica, miniature naval badge, accessories, additional strap, papers and edition number all contribute to the story. A Q157-Phenix without its commemorative accessories loses a meaningful part of what distinguishes the reference from a standard MN64. Their presence should therefore be reflected in the assessment of an individual watch.

Finally, 1,000 metres of water resistance does not eliminate the need for maintenance. A diving watch always depends on gaskets, sealing surfaces and correct crown closure, especially when it is genuinely used in water. Periodic pressure testing remains essential for an owner intending to use the Q157-Phenix as a genuine diving instrument. Other customers’ opinions are essential.

Conclusion

The ZRC Grands Fonds Q157-Phenix is aimed at enthusiasts wanting to combine a radical professional dive watch, a particularly successful maritime aesthetic and a commemorative story directly connected with the underwater world. Its sunray-blue dial and ceramic bezel give the edition a clearly different personality from more military MN64 references, while the 41.5 mm case, 6 o’clock crown, ECS®, Crown Protection System™ and 1,000-metre water resistance preserve the full technical credibility of the collection. The Elaboré Sellita SW300-1 prioritises robustness, thinness and serviceability, even if its 56-hour reserve is less spectacular than the capabilities of the case. The 200-piece limitation and Phénix presentation set finally strengthen its collectible interest.

To compare comfort, accuracy, dial behaviour under different light and the real-world experience of this highly unusual architecture, Dialicious customer reviews provide a particularly useful complement.

(Updated October 2026)