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G-Shock Gravitymaster

SKU: GRB300-1A4 

  • $300.00

  • G-Shock Authorized Dealer
  • Topper Guarantee
  • Extended Warranty more info

The sky is the limit

Purpose-built to operate in the harshest cockpit environments, the G-Shock Master of G Gravitymaster is the ultimate tool watch, built specifically for fighter pilots and aviation enthusiasts. 

This newly updated GRB300 series features a Carbon Core Guard structure, which delivers the shock-resistance, rigidity, and corrosion-resistance of carbon material used in aircraft fuselages. The carbon fiber-reinforced resin case and the seamless bezel design inspired by next-generation aircraft come together in a bold and powerful form. 

Envision the world through a pilot’s eyes with the flight log memory function for recording current location and time, as well as dual-time simultaneously displaying the time in two time zones. In addition, simply tap on the app to instantly switch between the time back home and local time — a practical function to make traveling abroad that much smoother.

Large, dimensional index marks and a metal bezel accentuating the large watch face exude functionality, enhancing the visibility that is so important for pilots, whose job demands intuitive reading of time.

The rotary disc indicator at the 9 o’clock position uses a dual-coil motor to ensure smooth rotation and functional beauty. The indicator not only rotates to display alarm on/off and stopwatch; it functions as a battery level indicator as well.

The high-contrast color scheme dotted with color accents on the dial and buttons evokes the look of a cockpit instrument panel, while dark color variations express the practical functionality of an aviation worldview.

Key resin components used in the case, bezel, and band are made with bio-based resin, a material expected to help reduce environmental impact



  • Carbon & Bio-Resin
  • Case size: 59 x 54 x 15mm
  • Strap: Resin strap with Stainless steel buckle
  • Solid caseback


  • Solar Powered
  • Power-saving feature
  • Day/Date feature
  • Timekeeping: hour, minute (hand moves every 10 seconds), second), 3 dials (dual time hour and minute, dual time 24-hour, day)

Additional Features

  • Water resistance: 200 meters
  • LED light (Super Illuminator)
  • Afterglow
  • Mobile link (Wireless linking using Bluetooth®)
  • Layer Guard Structure 
  • Dual time (Home City time swapping)
  • Countdown / Mission timer
  • Full auto-calendar (to year 2099)
  • Daily Alarm
  • 1-second stopwatch (Measuring capacity: 23:59'59) w/ elapsed time & split time

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