The ten-year battery interests me more than this G-Shock’s three eyes

I like the gray-and-black treatment more than I like the shape of this watch. The DW-5900 has a lot happening across the top of the face, and those three little displays make it feel busier than the square version from the same release. I can appreciate the character without wanting this to be my next G-Shock.

Casio calls the new finish Monotone Mix. It picks out the case and strap components in different shades, with a silver treatment around the display and honed metal hardware. The result is more restrained than a bright collaboration model. For me, the remaining issue is the underlying layout rather than the color choice.

The more useful module in the group

The DW-5900MTM-8 measures 51.4mm long, 46.8mm wide and 15.5mm thick, and Casio lists a weight of 67g. The upper displays and the broad resin case make that width visually obvious. This is a watch I would want to try on before assuming that the curved-looking outer shape makes it smaller on the wrist.

There is a practical reason someone might choose it over the simpler DW-5600. Casio lists world time across 48 cities and 29 time zones, plus five daily alarms. The stated battery life is about ten years on a CR2025, twice the five-year figure of the other basic Monotone Mix models. That is a useful distinction if I want to go longer between battery changes.

It also has 200m water resistance, shock resistance, mineral glass, an LED backlight, stopwatch and countdown timer. The ten-year figure is a manufacturer estimate, and I haven't tested it or used this exact module. It isn't solar powered, and automatic radio or phone time correction is not listed for this reference.

My problem is still the dial

I tend to want a fairly direct reading of the time from a G-Shock. I like the square case, and a large main digital display is enough for most of what I would actually do with it. The three windows above the time on the 5900 give it a distinctive personality, but they also pull my eye away from the information I want first.

The official wrist photograph helps more than the isolated product image. It shows the height and the way the case extends around the face, although someone else's wrist can't establish my own fit. I would also check the display contrast outdoors, because studio lighting is very forgiving to digital screens.

Casio lists a November 2026 release, while the Japanese retailer Time Station NEO gives November 7 for its local launch. Neither establishes a US sale date. I have no confirmed USD price as of November 3.

I give it 61 out of 120 bezel clicks. The longer battery life and extra world-time functions are useful, but I would choose the quieter-looking DW-5600 from this group.