Charlie Paris Concordia GMT: owner reviews and feedback

The Charlie Paris Concordia GMT, launched in 2023, translates the Concordia exploration watch into an architecture capable of displaying two time zones simultaneously without abandoning the characteristics that established the collection: strong legibility, a unidirectional rotating bezel, screw-down crown and 300 metres of water resistance. The first generation uses a 40 mm stainless-steel case and Swiss automatic Soprod C125 calibre, with independently adjustable GMT hand, date at 6 o’clock, 28,800-vibration frequency and approximately 40 to 42 hours of power reserve. In September 2026, Charlie Paris substantially redesigns the model: diameter increases to 40.5 mm, the sapphire becomes more strongly domed, dial and 24-hour flange are redesigned and the Swiss movement is replaced by the Japanese TMI/Seiko NH34. This evolution dramatically lowers the price while retaining a caller-style GMT architecture, 300-metre water resistance and the model’s travel-oriented tool-watch purpose.

Design & legibility: combining dive-watch and GMT functions without overloading the dial

The challenge of combining a dive watch with a second time zone lies in organising a large amount of information. Charlie Paris preserves the external bezel for elapsed-time measurement and places the 24-hour GMT scale on a fixed flange inside the dial. This separation preserves both a genuine timing bezel and permanent reading of the second time zone. The watch consequently remains visually close to a conventional diver even though a fourth hand joins the standard hours, minutes and seconds.

On the 2023 generation, the flange is split into two colours corresponding to twelve daytime and twelve night-time hours. The principle returns in a more developed form in 2026 with a redesigned two-tone luminous 24-hour scale. Reading the GMT is particularly intuitive because the large tip of the dedicated hand points directly to a value between 1 and 24, removing any ambiguity between morning and evening. The day-night flange gives Concordia GMT a practical function while also contributing strongly to its graphic identity. It introduces colour without forcing Charlie Paris to replace the outer dive bezel with a bidirectional 24-hour GMT bezel.

The main indications retain large applied markers and broad hands generously filled with Super-LumiNova. On the 2026 versions, Charlie Paris even separates local and GMT luminescence by colour: primary time glows green while the second-time-zone indications use blue. The different luminous colours keep the GMT function genuinely usable in darkness. This is particularly relevant on a watch intended for travel and operation across very different environments.

The date changes between the two generations. The first Concordia GMT positions it at 6 o’clock, preserving very clear vertical symmetry. The 2026 generation moves it to 3 o’clock in the current configuration, more closely following the standard architecture of the NH34. The relocated date is one of the easiest visual distinctions between the 2023 Concordia GMT and the redesigned 2026 version. It slightly alters dial balance but frees the lower half and accompanies the broader redesign of the flange and hour markers.

Colour is another important part of the model’s personality. In 2023, Charlie Paris notably offers Blue, Black, Dune and Latitude 0°, the last using a textured green dial reminiscent of tree bark. In 2026, the palette becomes Antarctic Blue, Black, Tundra, Sage and Bordeaux. Each colour changes the perceived personality of the watch as much as it changes its simple appearance. Antarctic Blue and Black remain very traditional, Tundra prioritises brightness, Sage feels more contemporary and Bordeaux gives the tool watch a substantially warmer character.

The sapphire crystal also contributes to the visual evolution. The first generation already has a slightly domed antireflective sapphire, but the 2026 watch receives a 3 mm crystal with a stated 1.5 mm dome. It takes overall height to approximately 13.5 mm while the case itself measures 11.75 mm. The strongly domed sapphire gives the dial additional depth and reinforces the neo-vintage character of the new generation. Antireflective treatment limits unwanted reflections, although the pronounced curvature naturally remains more visible at certain viewing angles than a flat crystal.

Case, bezel and comfort: 300 metres in a restrained format

The 2023 Concordia GMT uses a 316L stainless-steel case measuring 40 mm in diameter, 47.5 mm long and approximately 12.5 mm thick. These dimensions were widely appreciated for their balance because they integrate the GMT complication without turning the watch into an oversized instrument. The relationship between 40 mm diameter and 47.5 mm lug-to-lug gives the first Concordia GMT sporting presence without excess. On an average wrist, it feels compact for a watch rated to 300 metres.

In 2026, diameter increases to 40.5 mm while length remains 47.5 mm. Case thickness decreases to 11.75 mm excluding the crystal, while total height with the sapphire reaches approximately 13.5 mm. The difference in diameter is therefore almost imperceptible, while the revised crystal profile changes the sense of volume more substantially. The 2026 generation retains virtually the same wrist footprint while giving the watch greater visual depth. It is a subtler evolution than the extensive redesign of the collection might initially suggest.

The external bezel remains unidirectional and uses an anodised-aluminium insert with elapsed-time graduation and a luminous marker at 12 o’clock. This allows Concordia GMT to function genuinely as a diver or simply as a visual timer for measuring durations. Charlie Paris deliberately preserves the dive bezel instead of replacing it with a 24-hour GMT bezel. The second time zone therefore remains on the fixed flange, limiting the watch to two simultaneous time indications but preserving its dual identity for terrestrial and aquatic exploration.

The screw-down crown is essential to the 300-metre water-resistance rating. Since the first GMT, it has been protected by integrated crown guards and uses a coloured insert. The current generation adds a red marker visible on the stem when the crown is not fully screwed down. The red indicator is a simple safety feature reminding the owner to secure the crown correctly before exposure to water. This is especially relevant on a GMT watch because the crown is likely to be operated more frequently when changing time zones than on a conventional dive watch.

The screwed caseback incorporates sapphire, allowing the movement and Charlie-signed oscillating weight to be viewed. Such an opening is comparatively unusual on a 300-metre tool watch, as many divers use a solid back. The transparent back preserves a visible horological dimension without sacrificing the stated 30 ATM rating. On the 2026 generation, NH34 finishing is more industrial than that of the former Soprod C125, but observing the rotor and automatic winding system remains interesting.

Lug width is 20 mm and Charlie Paris now offers a tool-free quick-change system. Options include three-link and five-link steel bracelets, Milanese mesh, leather, rubber and nylon. The broad choice of straps can transform Concordia GMT from a technical diver into a more urban travel watch. Rubber and nylon naturally make greater sense for water and sport, steel offers strong everyday versatility, while leather is better reserved for drier conditions.

Soprod C125 followed by Seiko NH34: two generations of caller GMT

The first Concordia GMT uses the Swiss automatic Soprod C125 operating at 28,800 vibrations per hour, or 4 Hz. It has 25 jewels according to Charlie Paris specifications and provides approximately 40 to 42 hours of reserve depending on published documentation over the life of the watch. The C125 gives the 2023 Concordia GMT a caller-style architecture with independent adjustment of the 24-hour hand. This allows the reference time zone to be changed without stopping the watch but does not allow the local hour hand itself to jump independently as it would on a traveller GMT.

This distinction matters during travel. With a traveller GMT, the user normally moves the local hour hand forward or backward in one-hour steps when crossing a time zone while leaving the GMT hand on home time. With the C125, the independently adjusted indication is instead the GMT hand. Concordia GMT is therefore particularly well suited to someone regularly monitoring a distant time rather than someone constantly crossing multiple time zones. For a wearer tracking a New York or Tokyo office from Paris, for example, the system remains highly practical.

The 2026 version replaces the Swiss calibre with the Japanese TMI/Seiko NH34. It operates at 21,600 vibrations per hour, or 3 Hz, contains 24 jewels and provides approximately 41 hours of power reserve. It supports manual winding and hacking seconds. NH34 retains exactly the caller-GMT principle that already defined the first Concordia GMT. Changing movement therefore does not alter the philosophy of use, but it does change frequency, finishing level, price and calibre availability.

NH34 adjustment uses the crown’s first click in both directions. One direction provides quick correction of the date while the other advances the GMT hand in one-hour steps. The next position stops the seconds and adjusts the principal time display. The setting system is straightforward and particularly well suited to monitoring a permanent second time zone. Conventional precautions around date adjustment near midnight should nevertheless be observed to avoid forcing the calendar mechanism while it is already engaged.

Moving from Soprod C125 to NH34 produces a dramatic reduction in retail positioning. The 2023 generation sat around €1,200 to €1,400 depending on strap, bracelet and local taxation, while the 2026 watch launched at approximately €645 on a strap and €695 on a steel bracelet. The new movement allows Charlie Paris to almost halve the price positioning of Concordia GMT. The collector gives up the 4 Hz Swiss calibre and its more premium character, but gains an extremely common movement that may prove simpler to maintain over the long term.

NH34 also offers a major advantage in availability. It is used by a very large number of brands and microbrands, giving it an extensive parts ecosystem and widespread familiarity among watchmakers. The C125 is more exclusive but considerably less common. The 2026 generation therefore clearly prioritises industrial robustness and serviceability over mechanical rarity. For an accessible tool watch this choice is coherent, even if enthusiasts attached to the Swiss movement of the original generation may prefer the earlier model.

Chronological milestones and main models (2018–2026)

(2018) Charlie Paris Concordia Antarctic Birth of the Collection:

The Charlie Paris Concordia is developed in 2018 to accompany French explorer Matthieu Tordeur on his solo, unsupported journey between Hercules Inlet and the South Pole. The expedition covers approximately 1,150 kilometres over 51 days in temperatures falling as low as -37°C. The automatic Concordia used for the expedition employs an ETA 2824-2 whose lubricants are adapted for very low temperatures, while a smaller quartz version completes the commercial range. This origin immediately gives Concordia the identity of a genuine tool watch rather than simply an aesthetically styled diver. The name itself also refers to the Franco-Italian Concordia research station in the interior of Antarctica. Future GMT watches directly preserve this relationship between travel, exploration, substantial water resistance and legibility.

(2023) Charlie Paris Concordia GMT Blue First Production GMT:

The Charlie Paris Concordia GMT Blue is one of four inaugural versions introduced in 2023. Its 40 mm stainless-steel case measures 47.5 mm long and 12.5 mm thick, retains 300 metres of water resistance and uses a unidirectional diving bezel. The lightly sandblasted blue dial is surrounded by a blue-and-white two-tone 24-hour flange, while the date remains at 6 o’clock. Automatic Soprod C125 provides an independently adjustable GMT hand, 4 Hz frequency and approximately 40 hours of reserve. Blue is initially planned in a 100-piece series for the first year, while selected other colours are announced in editions of only 50 watches.

(2023) Charlie Paris Concordia GMT Dune Brown Neo-Vintage Palette:

The Charlie Paris Concordia GMT Dune uses the same technical platform but adopts a smoked brown dial, chocolate-and-beige flange and cream-toned luminous hour markers. The combination gives it a significantly more retro appearance than Blue or Black even though the construction remains that of a modern 300-metre tool watch. Soprod C125 remains visible through the sapphire back and GMT-hand adjustment remains independent. The launch edition is limited to 50 pieces. Dune plays an important role in defining the first Concordia GMT because it demonstrates that a watch combining diving and travel functions can use a warm, almost dress-oriented palette without giving up night-time legibility or a screw-down crown.

(2023) Charlie Paris Concordia GMT Latitude 0° Textured Green Dial:

The Charlie Paris Concordia GMT Latitude 0° is the most distinctive variant of the first generation. Limited to 50 pieces, it receives a smoked green heavily textured dial often described as resembling tree bark, combined with a green-and-beige flange and a discreet GMT hand whose stem visually blends into the dial. The contrast between natural-looking texture and dive-watch architecture gives this version an especially strong personality. It retains the 40 mm case, 300-metre water resistance, sapphire crystal, date at 6 o’clock and Soprod C125. Its name directly references the equator and reinforces the theme of travel already inherent in the GMT concept.

(2023) Charlie Paris Concordia GMT Black Most Technical Expression:

The Charlie Paris Concordia GMT Black completes the launch with a more restrained interpretation based on a black dial, black bezel and flange in grey and white. It uses the same C125, 300-metre rating and dimensions as the other 2023 references. Legibility is especially direct because of the strong contrast between luminous markers and dark dial. This configuration is initially announced in a 50-piece launch series. Black emphasises the tool-watch identity more strongly than Dune or Latitude 0° and is an interesting reference for someone seeking the first generation with a minimum of decorative elements while retaining the characteristic two-tone 24-hour flange.

(2026) Charlie Concordia GMT New NH34 Generation:

In September 2026, the Charlie Concordia GMT receives a major redesign. The case increases to 40.5 mm while retaining 47.5 mm length, the middle case measures 11.75 mm and the strongly domed sapphire takes total height to approximately 13.5 mm. The movement becomes a Japanese TMI/Seiko NH34 operating at 3 Hz with 24 jewels and a 41-hour reserve, still with an independently adjustable GMT hand. The date moves to 3 o’clock, the markers are redesigned and night-time reading separates local time and GMT through two colours of Super-LumiNova. Five dials are offered: Antarctic Blue, Black, Tundra, Sage and Bordeaux. The price drops dramatically, moving Concordia GMT into a far more accessible category without reducing its 300-metre water resistance.

Choosing the right version: Soprod 2023 or NH34 2026

The 2023 generation will appeal most strongly to collectors interested in the Swiss movement and the first interpretation of Concordia GMT. Its Soprod C125 operates at 4 Hz and the original Dune, Latitude 0° and Black series are particularly small. The first generation is the stronger choice when rarity and model history matter more than purchase price or ease of servicing. Latitude 0° also has a textured dial with no direct equivalent in the 2026 range.

The 2026 generation is the more rational purchase for regular daily use. NH34 is common, robust, easy to service and the complete watch costs considerably less. The 300-metre rating, sapphire crystal, unidirectional bezel and GMT complication all remain. The 2026 version probably offers the strongest balance of functions, robustness and price in the history of Concordia GMT. Its case also remains sufficiently compact despite the more strongly domed crystal.

The distinction between caller and traveller GMT should be understood before purchase. Both Concordia GMT generations independently adjust the 24-hour hand rather than the local hour hand. For tracking a colleague, relative or market in another time zone, this architecture works perfectly. A traveller who changes local time very frequently may instead prefer a traveller-GMT calibre. The difference concerns use rather than quality.

For diving or water sports, rubber, nylon or steel are naturally preferable to leather. The crown should always be fully screwed down, and the red safety marker on the 2026 generation provides a useful visual reminder. Periodic pressure testing is recommended if the stated 300-metre capability is genuinely used. A watch worn only in urban conditions naturally requires less attention on this point.

Finally, colour should be selected according to the actual role of the watch. Black and Antarctic Blue are the most universal, Tundra prioritises brightness, Sage provides a more contemporary character and Bordeaux is considerably more assertive. The strongest choice remains the dial that preserves immediate reading under the conditions in which the watch will actually be worn. Other customers’ opinions are essential.

Conclusion

The Charlie Paris Concordia GMT successfully combines dive-watch and GMT functions without sacrificing the legibility or reasonable proportions that make the Concordia family appealing. The first 2023 generation stands out through its Swiss Soprod C125, limited launch series and particularly distinctive Dune or Latitude 0° dials, while the 2026 redesign prioritises accessibility, serviceability and a broader palette around the TMI/Seiko NH34. In both cases, the architecture remains a caller GMT with independently adjustable 24-hour hand, unidirectional diving bezel and 300 metres of water resistance. The move from 40 to 40.5 mm makes little difference to comfort, whereas the new domed crystal, 3 o’clock date and dual-colour luminescence give the current generation a noticeably renewed identity.

To compare comfort, accuracy, GMT legibility, bracelet quality, behaviour in aquatic use and the real-world experience of both movement generations with extended ownership, Dialicious customer reviews provide a particularly useful complement.

(Updated October 2026)