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G-Shock Mudmaster GG-B100Y-1A and Rangeman GW-9400Y-1 (JP: GW-9400YJ-1) with emergency yellow accents

G-Shock Mudmaster GG-B100Y-1A and Rangeman GW-9400YJ-1 (Japan: GG-B100Y-1AJF and GW-9400YJ-1JF)

January 2023 is looking to be a very active month for new releases as two new colorways for popular Master of G models will be added to the lineup: the black and yellow Mudmaster GG-B100Y-1A and Rangeman GW-9400YJ-1. Both of these models feature shock resistance, 200-meter water resistance, and mud and dust resistance. They are both equipped with a pressure sensor (altimeter and barometer), compass, and thermometer. The GG-B100Y-1A also has a step counter. The GG-B100Y-1A has a carbon fiber insert bezel, and the GW-9400YJ-1 has a carbon fiber insert band. The Mudmaster GG-B100Y-1A is battery-powered with Bluetooth smartphone link, and the Rangeman GW-9400YJ-1 has Tough Solar power and Multi-Band 6 auto radio time correction.

Based on the Japanese model names (ending in “JF”), these are standard releases and not designated as limited editions. However, sometimes standard releases are discontinued fairly early, as we saw with the GW-9400J-1BJF. It’s very possible that there will be another black and yellow GW-9400 model for an international release (such as a GW-9400Y-1) that has a standard resin band without the carbon fiber insert, like we saw with the GW-9400-1B.

Update: The GW-9400Y-1 with standard resin band is being released internationally. G-Shock U.S. released the GGB100Y-1A ($380) and GW9400Y-1 ($330).

G-Shock GG-B100Y-1A

G-Shock GG-B100Y-1A Mudmaster

Black with yellow accents on the bezel, button shaft, and dial. Yellow resin back cover.

Dimensions: 55.4 x 51.3 x 19.4 mm Weight: 92 grams
Battery (Lifespan): CR2025 (approx. 2 years)
Series: GG-B100 Mudmaster Price: $380 (GGB100Y-1A)

GGB100Y-1A at Casio GGB100Y-1A at Reeds

GG-B100Y-1A Angle

GG-B100Y-1A Case Back

G-Shock GW-9400Y-1

Black with yellow accents on the bezel, button shafts, face, and inner band. Standard resin band.

G-Shock GW-9400Y-1

Dimensions: 55.2 x 53.5 x 18.2 mm Weight: 93 grams
Power: Tough Solar
Series: GW-9400 Rangeman Price: $330 (GW9400Y-1)

GW9400Y-1 at Casio GW9400Y-1 at Reeds

GW-9400Y-1 Angle

GW-9400Y-1 Case Back

G-Shock GW-9400YJ-1

Japan-only model with carbon fiber insert band.

G-Shock GW-9400YJ-1JF Rangeman

Black with yellow accents on the bezel, button shafts, face, and inner band. Carbon fiber insert band. Japan-only model.

Dimensions: 55.2 x 53.5 x 18.2 mm Weight: 93 grams
Power: Tough Solar
Series: GW-9400 Rangeman Price: 55,000 yen (GW-9400YJ-1JF)

GW-9400YJ-1JF on eBay

Specifications: GG-B100 Versus GW-9400

(Prices shown are for different models.)


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  • Smartphone App
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  • World Time
  • World Time Zones
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  • Daylight Saving Time
  • Stopwatch
  • Stopwatch Unit
  • Stopwatch Max Range
  • Measuring Modes
  • Countdown Timer
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  • Alarm
  • Hourly Time Signal
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  • 12/24-Hour Format
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  • Multi-Band 6 (Auto Time Correction)
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Isaac Maccabee
Isaac Maccabee
10 days ago

FYI, it looks like both of these models are now on sale in the U.S. Perhaps you can put up your affiliate link?

Isaac Maccabee
Isaac Maccabee
9 days ago
Reply to  G-Central

The pleasure is all mine!

Dave
Dave
7 days ago

Will the G-Shock GGB100Y-1A come to the Netherlands through official retailers? Sorry if I missed that in the article.

G-Central G-Shock Fan Site
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