G-SHOCK-GRB300-1A-CASIO Australia
G-SHOCK-GRB300-1A-CASIO Australia
G-SHOCK-GRB300-1A-CASIO Australia
G-SHOCK-GRB300-1A-CASIO Australia
G-SHOCK-GRB300-1A-CASIO Australia
G-SHOCK-GRB300-1A-CASIO Australia
G-SHOCK-GRB300-1A-CASIO Australia
G-SHOCK-GRB300-1A-CASIO Australia
G-SHOCK-GRB300-1A-CASIO Australia
G-SHOCK-GRB300-1A-CASIO Australia
G-SHOCK-GRB300-1A-CASIO Australia
G-SHOCK-GRB300-1A-CASIO Australia
G-SHOCK-GRB300-1A-CASIO Australia
G-SHOCK-GRB300-1A-CASIO Australia

GRB300-1A

GRAVITY MASTER

Regular price$649.00
/
Tax included. Shipping calculated at checkout.

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 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 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.

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 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 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.

Band Type:

  • Bio-based Resin Band

Case and Bezel material:

  • Carbon
  • Bio-based Resin

Size:

59 × 54.7 × 15.7 mm

Colour:

Black

Compatible band size:

145 to 215 mm

Glass:

  • Mineral Glass

Weight:

71 g

Water resistance:

  • 200 M

World time:

World time
31 time zones (48 cities + coordinated universal time)
City code display
Daylight saving on/off

Timer:

Countdown timer
Measuring unit: 1 second
Countdown range: 60 minutes
Countdown start time setting range: 1 to 60 minutes (1-minute increments)

Light:

LED light (Super Illuminator)
Afterglow

Calendar:

  • Full auto-calendar (to year 2099)

Stopwatch:

1/100-second stopwatch
Measuring capacity: 23:59'59.99''
Measuring modes: Elapsed time, split time, 1st-2nd place times

Alarm/hourly time signal:

  • 5 daily alarms (with 1 snooze alarm)
  • Hourly Time Signal

Mute feature:

  • Button operation tone on/off

Battery display/alert

  • Low Battery Warning

Construction:

Shock Resistant
Carbon Core Guard structure

Time Adjustment:

  • Bluetooth: Connects to a smartphone and automatically adjusts the time

Power supply and battery life:

Tough Solar (Solar powered)

Surface treatment:

Other: Neobrite
Screw Lock Crown

Light Color:

  • White

Accuracy:

  • ±15 seconds per month

Other features:

12/24-hour format
Regular timekeeping:
∙ Analogue: 3 hands (hour, minute (hand moves every 10 seconds), second)
∙ Digital: Hour, minute, second, pm, month, date, day

Sale items are not eligible for return or exchange unless deemed faulty.

Product 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.

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.

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.

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 head-up display (HUD). These distinctive combinations of colour deliver practical functionality expressing an aviation worldview.

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.

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.