Casio has added five new G-Shock models since early July, and there’s a decent chance you scrolled past every one of them. No movie tie-in, no Pokémon collab, no celebrity campaign behind these. Five capable Casio G-Shock Watches watches landed on Casio’s international site with almost no noise, and a couple of them are more interesting than the launches that got the headlines.
Three of the five share a single design theme, a gold and brown finish Casio calls Master in Horizon Gold. The other two go in completely different directions: a £100 digital with a feature most brands dropped years ago, and a surfer’s signature model that squeezes a heart rate sensor into a classic square case.
At a Glance
All five Casio G-Shock Watches arrived in July or August 2026 without much fanfare. Here’s the quick read before we get into each one.
- GG-B100XMH-5A Mudmaster: analog-digital quad-sensor tool watch in Horizon Gold, ¥60,500 (about $383)
- GW-9500MH-5 Mudman: solar, radio-controlled Triple Sensor digital, ¥63,800 (about $404)
- GR-B300H-5A Gravitymaster: analog dual-time pilot’s watch with solar and Bluetooth, ¥49,500 (about $314)
- GD-350S-1: budget digital with rare vibration alerts, £100 (about $135)
- GBX-H5600KI-5 G-LIDE: Kanoa Igarashi signature surf watch with a heart rate sensor, ¥50,600 (about $314)
1. GG-B100XMH-5A: The Mudmaster Goes Gold
The GG-B100XMH-5A is one of three Master of G models in Casio’s Horizon Gold set, on pre-order in Japan ahead of an August retail release. The look does the talking: a gold-coated metal bezel, brown accents, and a dark brown bio-based resin band. The price is ¥60,500, or about $383, right where the standard GG-B100 sits.
Under the new colors, it’s the same tool watch Casio has refined since 2019. You get a digital compass, altimeter, barometer, thermometer, and a step counter. The stainless steel bezel and carbon-reinforced resin case use Casio’s Carbon Core Guard build, rated shock resistant, mud resistant, and water resistant to 200 meters. It measures 55.4 × 51.3 × 19.4 mm and weighs 104 grams, the heaviest of the Horizon Gold trio.
There’s no solar charging here. It runs on a CR2025 battery rated for about two years, and Bluetooth links it to the Casio Watches app for time adjustment, location memory, and a mission log. If the GDG-B100 Mudman we covered this spring caught your eye, this is the warmer cousin with real metal on the bezel.
Casio G-Shock Mudmaster GG-B100XMH-5A
Price: ¥60,500 (about $383)
Where to Buy: Casio
2. GW-9500MH-5: The Fully Loaded Mudman
The GW-9500MH-5 is the most expensive Horizon Gold model at ¥63,800, roughly $404, and the spec sheet explains the premium. This is the fully digital entry: Tough Solar charging, Multi-Band 6 radio-controlled timekeeping, and Casio’s Triple Sensor covering compass bearing, altitude, barometric pressure, and temperature. The duplex LCD lays a compass graphic over the standard readout, so you can check direction without losing the time. There’s even a sunrise and sunset display for any date you pick.
Even with that sensor stack, it stays wearable at 88 grams and 56.7 × 52.7 × 14.8 mm. Bio-based carbon and stainless steel make up the case, the band is bio-based resin, and the whole package is mud, dust, and shock resistant with 200 meters of water resistance. Battery life runs about 6 months on a full charge in normal use, stretching to 26 months if you store it in the dark with power saving on.
Casio G-Shock Mudman GW-9500MH-5
Price: ¥63,800 (about $404)
Where to Buy: Casio
3. GR-B300H-5A: The Pilot’s Quiet Pick
The Gravitymaster GR-B300H-5A is the cheapest Horizon Gold watch at ¥49,500, about $314, and the easiest one to miss. There’s no compass, no altimeter, no thermometer on board. What you get instead is a clean analog dual-time display built for people who cross time zones for a living.
Dual time is the whole point here. One action swaps home time and local time, and the large raised indexes and metal bezel keep the face readable at a glance. The Casio Watches app adds around 300 world time cities, a flight log, and a phone finder. The rotary disc at 9 o’clock runs on a dual-coil motor and rotates to show alarm status, stopwatch mode, and battery level, a small mechanical detail that’s fun to watch work.
Tough Solar handles the power, and the battery rating lands at about 5 months in normal use or 18 months stored in the dark with power saving. A screw-lock crown and Neobrite lume round out the pilot brief.
At 71 grams and 59 × 54.7 × 15.7 mm, it’s the lightest of the trio by a wide margin. If you fly often and don’t care about trail sensors, this is the Horizon Gold model that makes the most sense on your wrist.
Casio G-Shock Gravitymaster GR-B300H-5A
Price: ¥49,500 (about $314)
Where to Buy: Casio
4. GD-350S-1: The £100 Sleeper
The GD-350S-1 might be the most interesting watch here, and it’s the cheapest by far at £100 in the UK, about $135. It’s the first new GD-350 since 2023, and it keeps the feature that built the line a following: a vibration alarm. Alarms and the countdown timer can buzz, flash, or beep, which makes it one of the few non-MIP G-Shocks that can nudge you without making a sound.
Inside is Casio’s 3403 module: a 1/100-second stopwatch, countdown timer, 35 time zones with daylight saving, multiple daily alarms, and a CR2032 battery rated around five years. Water resistance holds at 200 meters, and the dimensions track with the GD-350 family’s 53.4 × 50.8 × 18 mm, 75-gram footprint. The black resin case gets a squared white frame around a light background display with red accents, a retro look that stands out in a lineup of all-black digitals. As of this writing it’s on pre-order in the UK with a wider release expected later in August, though Japan and US timing haven’t been formally announced.
Casio G-Shock GD-350S-1
Price: £100 (about $135)
Where to Buy: Casio
5. GBX-H5600KI-5: The Surfer’s Signature Square
Casio doesn’t hand out four signature models to many athletes, but Kanoa Igarashi earned his. The Olympic silver medalist’s fourth G-Shock hit pre-order in Japan in early July at ¥50,600, about $314, and shipped later that month.
The GBX-H5600 platform is a surf watch greatest hits list: tide graph, moon data, sunrise and sunset times, and 200 meters of water resistance. This generation adds an optical heart rate sensor, step counter, Bluetooth, and vibration alerts, plus solar and wired charging. Training features are powered by Polar, and the MIP LCD stays readable in full sun.
The case runs 51.1 × 44.5 × 17.3 mm in carbon-reinforced resin, with mineral glass and a two-color bio-based bezel and band in Igarashi’s colors. Casio bills it as about 18 grams lighter than the last generation despite the added sensor.
If you want a G-Shock that tracks training without wearing like a brick, this is your pick. It’s also the one most likely to sell out, since signature models don’t sit around.
Casio G-Shock G-LIDE GBX-H5600KI-5
Price: ¥50,600 (about $314)
Where to Buy: Casio
What to Look For
Solar or coin cell is the first fork in the road. The Mudman and Gravitymaster charge themselves, while the Mudmaster and GD-350S-1 run on standard batteries you’ll swap every few years. Neither answer is wrong. It comes down to whether you want to think about power at all.
Sensors are the second fork. If you hike or work outdoors, the Mudman and Mudmaster give you compass, altitude, pressure, and temperature readings. If you travel, the Gravitymaster’s dual time is the feature you’ll use every single day, and if you surf or train, the G-LIDE’s tide data and heart rate sensor do more for you than any Master of G model will.
Availability varies by model and market. Casio currently lists these watches among its new G-Shock products, but regional pricing and on-sale dates can differ. Check your local Casio storefront or an authorized retailer for the most current availability.
The Bottom Line
Casio’s summer 2026 sleeper picks cover more ground than most brands’ headline launches. The GW-9500MH-5 is the spec king, the GG-B100XMH-5A is the style play, and the GR-B300H-5A is the frequent flyer’s answer. The GD-350S-1 is the value story of the bunch at about $135, and the GBX-H5600KI-5 is the one surfers and gym regulars should grab before it’s gone.
For more Casio coverage, check out our roundup of the 10 Casio watch releases everyone is talking about, the louder siblings of everything on this list. And if charging smartwatches has worn you out, our piece on the G-Shock that counts steps without ever needing a charge is worth your time.
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