6 min read
Every few years, a watch arrives that the community has finished discussing before the manufacturer has said a word. The G-Shock 2500 Series is one of those. Leaked images circulated, a teaser followed, and the verdict was in: here was a cushion-shaped, softly shouldered G-Shock that looked, to many eyes, like something Gérald Genta might have sketched. The nickname arrived before the press release. Fans call it the “CasioNaut.”
Now that Casio has formally unveiled the line, with nine references across resin and metal, the more interesting question is whether the watch earns the attention beyond the hype. I think it does. Underneath the nickname is a coherent piece of industrial design, a genuinely new movement, and a rare moment of restraint from a brand that has rarely been accused of it.
The new G-Shock 2500 Series takes the brand’s founding idea of an indestructible watch and translates it into a fully analog form.
The Name, and What It Is Really About
Start with the wordplay, because it matters. G-Shock fans already have the “CasiOak,” the nickname the GA-2100 earned in 2019 for an octagonal bezel that recalled another Genta masterpiece. The CasioNaut follows the same logic, only softer. Round the edges, give the case pronounced shoulders, and the reference shifts to Genta’s other great design from 1976.
There is a distinction worth keeping, though. The CasiOak was a digital-display watch in an analog-looking costume. The 2500 is fully analog, with no LCD anywhere on the dial. In an era when the G-Shock catalog seems to reissue the same few silhouettes in new colors, that is a real departure.
Casio itself does not invite the hypey comparison. Its stated reference is far closer to home: the DW-5000C, the first G-Shock. The brand’s question, as it frames it, was what that original would become if reimagined for today in purely analog form. The octagonal bezel and the glass with its horizontal top and bottom edges were the starting points. The CasioNaut label is the public’s reading of the result. The DW-5000C is Casio’s.
A Purely Analog G-Shock
The 2500 Series is notable for what it omits. There is no LCD, no digital subdisplay, and no Bluetooth connectivity. Instead, the watch offers a two-hand central time display, a small seconds subdial at 9 o’clock, and a three-cell date aperture at 3 o’clock.
Its small seconds hand carries another meaningful detail: its tail is marked with the Shock Resist emblem. As it oscillates, it becomes a small, constant reminder that shock resistance is not a badge applied to the caseback but a system working continuously beneath the dial.
Multi-Mission Date: The Best Idea Here
The 2500’s most compelling innovation is the Multi-Mission Date display. At first glance, it appears to be a conventional date window. In fact, it is a fan-shaped, three-cell display at 3 o’clock that changes role according to the watch’s mode.
In normal timekeeping mode, it shows the date. Once the calendar is set - day, month, and year - it functions as a full automatic calendar through 2099, adjusting automatically for unequal month lengths and leap years. That alone would be useful, but Casio goes further.
Cycle modes using the pusher at 8 o’clock and the display becomes a stopwatch readout. The central hour and minute hands continue telling time normally, while the small seconds hand resets and measures elapsed seconds. Simultaneously, the Multi-Mission Date window displays elapsed stopwatch minutes. The result is a chronograph-like function without a dedicated counter, digital screen, or cluttered subdial.
It is an elegant solution to a longstanding analog-watch problem: how do you add real functionality without compromising legibility? Casio’s answer is to make one display perform multiple jobs. In stopwatch mode, the date wheel indicates “ST” before switching to elapsed minutes when the chronograph is started.
There is one practical limitation. Because the display reuses the date wheel, the stopwatch records up to 31 minutes and 59 seconds; after that, it stops. For short runs, intervals, parking meters, or timed tasks, it is excellent.
Engineering Beneath the Beauty
The 2500 is powered by Casio’s new QW-5757 quartz module, developed specifically for the series and produced at Yamagata Casio, the G-Shock “mother factory.”
Its most important mechanical feature is the Shock Release Hand system, first introduced on the GA-V01 in 2025. Rather than fixing the minute hand rigidly to its arbor, Casio holds it magnetically. Under a significant impact, the hand can move with the force rather than bending or dislodging, it then returns to its correct position within a few minutes.
This is exactly the kind of unglamorous innovation that defines G-Shock. It does not add a complication for marketing purposes. It protects the watch’s core function, telling time, under the conditions for which the watch was built.
The series also includes a Second Hand Sleep function. When activated, it halts the small seconds hand to reduce power consumption, extending battery life from approximately two years to as much as five years.
Toughness, Properly Specified
Every 2500 model offers 200-meter water resistance, shock resistance, a one-second stopwatch, an LED light, and a full auto-calendar. Those are not incidental specifications, they place the watch firmly within G-Shock’s practical, everyday-use tradition rather than treating it as a merely stylized analog accessory.
The collection divides into three construction families across nine references: four resin GAC models, three GMC steel-bezel models, and two full steel GMC-2500D bracelet models. The GAC range arrives in black, dark green, white, and yellow, the GMC family spans black, silver, gold-tone, black, and blue-grey dial treatments.
The resin models measure approximately 46.7mm by 44.5mm, with a thickness of 12.7mm, the GMC models measure 46.7mm by 43.8mm and 12.9mm thick.
The Verdict, So Far
The case for the 2500 rests on what it is not. It is not another CasiOak recolor and not a nostalgia exercise. Casio could have simply put hands on an old silhouette and let the Nautilus chatter do the marketing. Instead, it built a new movement, introduced a new display concept, and gave the project a design philosophy specific enough to argue with.
Yes, the “CasioNaut” nickname will sell the watch. But the nickname is not the story. The story is that Casio has made a fully analog G-Shock that is visually refined, technically inventive, and still fundamentally built to be used - run with, worn in water, knocked about, and relied upon.
