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MASTER OF G
GRAVITYMASTER

GR-B300-1A

My GShock

The sky's the limit! Introducing the GRAVITYMASTER GR-B300, a piece of aviation-inspired professional gear designed to work even in the harshest environments, from the G-SHOCK MASTER of G line. The GR-B300 features a Carbon Core Guard structure, which delivers the shock-resistance, rigidity, and corrosion-resistance of carbon material used in aircraft fuselages. The carbon fibre-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 travelling 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 black and white colour scheme dotted with colour accents on the dial and buttons evokes the look of a cockpit instrument panel, while dark colour 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.

  • An organic form inspired by next-generation aircraft is expressed
  • Layer Guard with a fusion of different materials
  • Seamless design offering functional beauty
  • 3D face design for enhanced readability
  • Dual time: Simultaneous display of time in two cities
  • Colouration evoking the look of a cockpit
  • Back engraving
  • LED light

Specifications

FEATURES

Seamless design offering functional beauty

An organic form inspired by next-generation aircraft is expressed with the seamless exterior design. A sense of unity is achieved by connecting the exterior surfaces, from the case to the band, smoothly and seamlessly. This design creates a tough, cutting-edge look, seemly for a new addition to the GRAVITYMASTER line.

Side view of a black G-Shock GR-B300 wristwatch
Side view of a black G-Shock GR-B300 wristwatch

The individual elements of the three-layer dial of the Gravitymaster GR-B300 pilot watches

3D face design for enhanced readability

The large-diameter, triple-layer dial with a sense of depth ensures readability for pilots, whose job demands intuitive reading of time. In addition to large, dimensional index marks and inset dials inspired by instrument panels, the metal bezel accentuating the large watch face ensures this design exudes functionality.

The individual elements of the three-layer dial of the Gravitymaster GR-B300 pilot watches

Dual time: Simultaneous display of time in two cities

The main dial and inset dial simultaneously display times in two cities located in different time zones. A dedicated app makes it easy to configure world time settings. Switching between home time and world time is a snap, as well. This watch puts accurate time management just a fingertip away.

Close-up of the white hands and the sub-dial of a Master of G GR-B300 pilot watch
Close-up of the white hands and the sub-dial of a Master of G GR-B300 pilot watch

Three Master of G Gravitymaster GR-B300 models in front of cockpit backgrounds, from left to right: GR-B300-1A4, GR-B300-1A, GR-B300-8A2

Colouration evoking the look of a cockpit

A high-contrast black and white colour scheme enhances the visibility of the watch hands and index marks, components responsible for the most vital watch functions. Red and blue colour variations are offered as well, with the red model inspired by the display colour of a cockpit instrument panel's nighttime illumination, and the blue, that of a heads-up display (HUD). These distinctive combinations of colour deliver practical functionality expressing an aviation worldview.

Three Master of G Gravitymaster GR-B300 models in front of cockpit backgrounds, from left to right: GR-B300-1A4, GR-B300-1A, GR-B300-8A2

DETAILS

Layer Guard and Carbon Core Guard structures: Featuring innovative combinations of materials

The intricately shaped bezel employs integrated moulding and has two rings—a metal ring and a urethane ring—installed beneath it. This combination of materials gives the bezel—a structural component—a refined visual presence that embodies the intricacy and sophistication of next-generation aircraft. The case is made with carbon fibre-reinforced resin, a material delivering both strength and lightness. The side buttons have anti-slip texturing inspired by hazard warning stripe tapes, and the guards beneath the buttons have been eliminated for even better operability.


Close-up of the rotating bezel display of a Casio G-Shock Gravitymaster GR-B300 pilot watch

Rotary disc indicator: Offering display for multiple functions

The rotary disc indicator at the 9 o'clock position uses a dual-coil motor to ensure smooth rotation. It indicates battery level and alarm on/off status, as well as displaying motion linked to each mode.

Close-up of the rotating bezel display of a Casio G-Shock Gravitymaster GR-B300 pilot watch

Flight log: Helpful for flight history management

Sync the watch with a smartphone and press a button on the watch to record the current time and position on a map within the dedicated app — a useful function for managing flight logs with details including times and locations of departure and arrival. In addition, plotted data can be grouped for batch management of travel record details including points of departure, transit points, and home destinations.

*This app is currently in development, and specifications are not yet final.

A smartphone displays a map with a flight route marked on it, in the background: an aircraft on an airfield
A smartphone displays a map with a flight route marked on it, in the background: an aircraft on an airfield

A small pile of transparent resin granules

Attention to materials: Bio-based resin

Key resin components used in the case, bezel, and band are made with bio-based resin. Produced using renewable organic resources, this material is expected to help reduce environmental impact.

*Graphic is included for illustrative purposes.

A small pile of transparent resin granules

Solar-powered timekeeping with Bluetooth® for enhanced accuracy and reliability

A black Master of G GR-B300 Bluetooth® watch in front of a smartphone showing information about the watch
A black Master of G GR-B300 Bluetooth® watch in front of a smartphone showing information about the watch

The glowing dial of a Gravitymaster GR-B300 wristwatch in the dark

Super Illuminator (high-brightness LED light) for maintaining watch readability in the dark

*Image shows the GR-B300-1A.

The glowing dial of a Gravitymaster GR-B300 wristwatch in the dark

*The colour tone of the listed products may differ from the actual product in some cases.

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