The Mudman line has stayed stubbornly old-school for years: conventional LCDs, no fitness tracking, all toughness. A new leak suggests that’s about to change. Imagery from Casioblog (the same fan blog that called the F-B100W’s Bluetooth step tracker last year) shows the GDG-B100, what looks like the first Mudman with a memory-in-pixel (MIP) display and an onboard step counter, pulling the rugged classic into territory previously reserved for the G-Squad and Mudmaster lines. With Casio’s usual summer announcement window only weeks away, the question shifts from whether the GDG-B100 is coming to what it actually changes about the Mudman formula.
What is a MIP display?
| What is a MIP display? A MIP (Memory-in-Pixel) display is a low-power, always-on reflective LCD with memory built into each pixel. It only draws power when a pixel changes state, sips far less battery than a backlit LCD, and stays readable in direct sunlight, but it’s monochrome. |
If you’ve missed Casio’s recent releases, MIP (Memory-in-Pixel) is a reflective LCD technology (originally a Sharp innovation) that behaves more like the always-on screen on a Garmin Instinct or the front of a Kindle than a typical backlit LCD: high-contrast, sun-readable, and monochrome. Casio has been gradually rolling MIP into pricier G-Shocks, most recently the full-metal GMW-BZ5000RC-1, the resin GW-BX5600 square, and the fitness-focused DW-H5600. If the leak is accurate, the GDG-B100 would be the first time it reaches the Mudman family.
Two practical upsides:
- Battery life. MIP pixels only draw power when they change state, so a coin cell stretches much further than a backlit LCD. There’s no indication of Tough Solar in the leaked images, but if Casio adds it, runtime could be effectively indefinite.
- Outdoor readability. Reflective panels get brighter in direct sun instead of washing out, exactly what you want on a watch built for mud, sand, and trail use.
The trade-off is color. MIP is monochrome, typically high-contrast black-on-gray or black-on-white. If you want AMOLED-style notifications, look elsewhere. For a watch designed to survive abuse and stay legible at noon, it’s the right call.
GDG-B100 vs GW-9500 Mudman
The current Mudman flagship, the GW-9500, is a triple-sensor watch with thermometer, compass, altimeter/barometer, and Tough Solar, but it uses Casio’s duplex (dual-layer) LCD and has no step tracking. The GDG-B100 looks like a different bet: drop the high-end environmental sensors, add MIP and a pedometer, and target a lower price point.
| Feature | GW-9500 Mudman | GDG-B100 (rumored) |
|---|---|---|
| Display | Duplex LCD | MIP |
| Step counter | No | Yes |
| Compass / baro / thermo | Triple sensor | Unconfirmed |
| Bluetooth | No | Yes |
| Tough Solar | Yes | Unconfirmed |
| Water resistance | 200m | 200m |
| Price | ~$380 | $200–$250 (rumored) |
If the spec split holds, these read as complementary models, not direct replacements.
GDG-B100 design, build, and color options
The signature mud-resist gaskets are intact in the leaked renders, sealing the buttons and crown against grit. Around them, the GDG-B100 carries the usual Mudman silhouette: a thick resin case with reinforced guards flanking the buttons. This is not a watch built for the boardroom, though the all-black variant will inevitably end up in one.
Based on the leaked display layout, the watch appears to include a step counter and Bluetooth connectivity, with the latter presumably handling time sync and activity logging via the standard CASIO WATCHES app.
Beyond that, details are thin. The leak doesn’t confirm a training mode, optical heart-rate sensor (as seen on the fitness-focused DW-H5600), or any of the higher-end environmental sensors (thermometer, compass, barometer) that Casio typically reserves for the Mudmaster and Gulfmaster lines, starting around $420 with the Quad Sensor GG-B100 Mudmaster. Expect the usual G-Shock baseline (200m water resistance, world time, alarms, and a stopwatch) to carry over, but treat anything more specific as speculation until Casio’s official announcement.
Three color variants have surfaced so far: an all-black GDG-B100-1, the GDG-B100-1A3 with a green camo strap, and the GDG-B100-1A5 with a sand-colored strap.
GDG-B100 price and release date
Casioblog pegs the price at $200 to $250, which would slot the GDG-B100 below the existing Mudman GW-9500 and put it head-to-head with mid-range Bluetooth G-Shocks. An announcement is rumored for summer 2026, though Casio has not officially confirmed anything.
What this signals about Casio’s 2026 roadmap
The GDG-B100 won’t land in isolation. Casioblog’s running 2026 rumor sheet also names a GM-H5600 (a square fitness G-Shock), an EQB-1300 Edifice, and a GWR-B3000 Gravitymaster refresh. The GDG-B100 fits a pattern Casio has been quietly building for two years: MIP displays migrating down from flagships, Bluetooth showing up on more mid-range models, and step counters spreading from the G-Squad line into the rest of the catalog.
If that trajectory holds, the GDG-B100 won’t be the last 2026 G-Shock to drop a conventional LCD for MIP. It just happens to be the one bringing the change to the most traditionalist line in Casio’s catalog.
Should you wait for the GDG-B100?
If you’re shopping for a Mudman right now and you care about fitness tracking or always-on legibility, wait. The combination of MIP plus a step counter at a sub-$250 price would be the most significant Mudman update in years. If you need the GW-9500’s compass, altimeter, and barometer, the GDG-B100 doesn’t appear to replace it, so keep the GW-9500 on your shortlist.
What we still don’t know
Plenty of basics are missing from the leak. Casioblog’s images don’t confirm whether the GDG-B100 supports Tough Solar charging, and the full sensor loadout beyond the step counter (compass, thermometer, and altimeter) is unverified. Battery type and rated battery life are still open questions, as are the exact module number, Casio’s official spec sheet, and a confirmed release date with regional availability.
Casio GDG-B100 FAQ
Is the GDG-B100 the first Casio G-Shock with a MIP display?
No. It would be the first Mudman with one. Other G-Shocks already use MIP, including the GMW-BZ5000RC-1, GW-BX5600, and DW-H5600.
How much will the Casio GDG-B100 cost?
Around $200 to $250, according to the Casioblog leak. Casio has not confirmed pricing.
When is the GDG-B100 release date?
Summer 2026 is the rumored announcement window. No official date yet.
What colors will the GDG-B100 come in?
Three variants have leaked so far: GDG-B100-1 (all black), GDG-B100-1A3 (green camo strap), and GDG-B100-1A5 (sand-colored strap).
Does the GDG-B100 have Tough Solar?
Unconfirmed. The leaked imagery shows no clear evidence of solar charging.
Will the GDG-B100 have a heart-rate sensor?
The leak doesn’t show one. Casio reserves optical heart-rate sensors for fitness-focused G-Shocks like the DW-H5600.
NOTE: Cover is image is the Casio GW-9500-1JF [G-Shock Master of G Series MUDMAN Triple Sensor Model] available on Amazon. We’ll update this article as Casio confirms specs, pricing, and the release window.
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