Skip to search
Bestsellers     New arrivals     Limited Time Sale     Marketplace     67,050 Items
Japan : 4/24 04:36   EN
Europe, UK: Wednesday, Apr 29
USA: Monday, Apr 27
Australia: Wednesday, Apr 29
Asia: Tuesday, Apr 28
UAE: Tuesday, Apr 28

Order within 19 Hours 23 mins with Scheduled Delivery. If you place an order within this time, We will ship on Monday, Apr 27 2026. This delivery time is calculated by DHL & Fedex. You can check the exact delivery date on checkout page.

Buyer Protection

Full refund if not genuine. Full or partial refund, if the new item is not as described.

     Description (3,447 characters)

The GRAVITYMASTER GR-B300 is an aviation-themed watch from the G-SHOCK MASTER OF G series, designed for professionals working in harsh environments.

The GR-B300 is a GRAVITYMASTER that employs a shock-resistant "Carbon Core Guard" structure that takes advantage of the characteristics (shock resistance, rigidity, and deterioration resistance) of the carbon material that is also used in aircraft bodies.

The case is made of carbon fiber reinforced resin and the seamless bezel is inspired by next-generation aircraft, giving the watch the powerful form of the GRAVITYMASTER.

The watch also features a flight log function that records the current location and time, and a dual time function that displays the time in two time zones simultaneously, creating a worldview reminiscent of that of an aircraft or pilot.

In addition to the home time swap function, which allows you to instantly switch between your home time city and local time city by simply tapping a button on the app, the app also features a dual time function that allows you to simultaneously display the time in two cities, which is useful when traveling abroad.

To ensure visibility, which is important during flight when intuitive reading is required, large, three-dimensional hour markers and a metal bezel that accentuates the wide face are used to enhance the sense of functionality.

In addition, a dual coil motor is used for the disk hand at 9 o'clock to improve the movement and functionality of the hand.

In addition to the alarm ON/OFF function and the rotating stopwatch, it also serves as a battery indicator.

The dial and buttons feature the high-contrast accent colors seen in aircraft cockpits, but the design is in functional dark colors.

The case, bezel, and band are made of biomass plastic, which is expected to reduce the burden on the environment.

Time correction via Bluetooth® connection ensures the time accuracy required for aviation missions, and solar power makes it practical.

GRAVITYMASTER embodies the worldview of professional aviation and the "longing for the sky," while supporting the relentless challenge to the limits.


- Shock-resistant construction
・ Tough Solar (solar charging system)
- 20 ATM water resistance
- Mobile Link function (function linkage via Bluetooth® communication with compatible mobile phones)
- Dual time (with home time swap function)
・Stopwatch (1 second, 24 hour, split)
- Timer (set unit: 1 minute, maximum set: 24 hours, measured in 1 second units)
・ Electronic alarm
- Battery indicator display - Power saving function (hands stop moving after a certain period of time in a dark place to save power)
- Fully automatic calendar
- Date and day of the week display
・ LED light (Super Illuminator, with afterglow function)
・ Operating time from full charge without solar power generation When using functions: Approximately 5 months When in power saving mode: Approximately 18 months * When not linked to a smartphone, it operates with normal quartz accuracy (average monthly difference of ±15 seconds)



Tags:

Black  


Related products

Products Similar to 'CASIO'

New arrivals

HOT ITEMS

Bestseller
Panasonic Full-Frame Mirrorless Camera
Panasonic Full-Frame Mirrorless Camera "...
267,288 YEN
SEIKO SELECTION SBTR017 Men's
SEIKO SELECTION SBTR017 Men's

24,651 YEN
CASIO G-Shock Watch MIP LCD GW-BX5600-1A1JF Men's All Black (N)
CASIO G-Shock Watch MIP LCD GW-BX5600-1A...
48,884 YEN
Hasegawa 1/20 Sculpture Beauty's No.03 Sporty Unpainted Resin Kit SP521
Hasegawa 1/20 Sculpture Beauty's No....
4,489 YEN
New Model
CASIO EDIFICE Watch (Official Japanese Product) Collaboration Model Commemorating the 60th Anniversary of Honda's First F1 Victory  ECB-2300HR-1AJR Men's White
CASIO EDIFICE Watch (Official Japanese P...
147,300 YEN
Bestseller New Model
Shimano 26 Calcutta Conquest DC 200HG RIGHT Right-Handed (2026 Model) Baitcasting Reel /(5) [Σ01]
Shimano 26 Calcutta Conquest DC 200HG RI...
78,730 YEN
SEIKO Seiko Selection Nano Universe Collaboration Model Ladies Analog Quartz SSEH018 Ladies Black
SEIKO Seiko Selection Nano Universe Coll...
36,828 YEN
SEIKO Watch Seiko Selection nano universe collaboration SSEH026
SEIKO Watch Seiko Selection nano univers...
36,828 YEN
Mega House Portrait.Of.Pirates: Tashigi (Beauty version of swimsuit) Ex model PVC figure 1
Mega House Portrait.Of.Pirates: Tashigi ...

31,000 YEN
Bestseller
TAKARA TOMY BEYBLADE X UX-15 Shark Scale Deck Set
TAKARA TOMY BEYBLADE X UX-15 Shark Scale...
8,655 YEN
New Model
CASIO G-Shock Watch (Official Japanese Product) DW-5600MNC-8A2JF Men's Dark Gray
CASIO G-Shock Watch (Official Japanese P...
22,097 YEN
CASIO G-SHOCK FROGMAN radio wave solar GWF-1000-1JF men
CASIO G-SHOCK FROGMAN radio wave solar G...

75,460 YEN

Bestsellers

CASIO G-SHOCK GRAVITYMASTER Bluetooth Eq... 4549526373084

The GRAVITYMASTER GR-B300 is an aviation-themed watch from the G-SHOCK MASTER OF G series, designed for professionals working in harsh environments.

The GR-B300 is a GRAVITYMASTER that employs a shock-resistant "Carbon Core Guard" structure that takes advantage of the characteristics (shock resistance, rigidity, and deterioration resistance) of the carbon material that is also used in aircraft bodies.

The case is made of carbon fiber reinforced resin and the seamless bezel is inspired by next-generation aircraft, giving the watch the powerful form of the GRAVITYMASTER.

The watch also features a flight log function that records the current location and time, and a dual time function that displays the time in two time zones simultaneously, creating a worldview reminiscent of that of an aircraft or pilot.

In addition to the home time swap function, which allows you to instantly switch between your home time city and local time city by simply tapping a button on the app, the app also features a dual time function that allows you to simultaneously display the time in two cities, which is useful when traveling abroad.

To ensure visibility, which is important during flight when intuitive reading is required, large, three-dimensional hour markers and a metal bezel that accentuates the wide face are used to enhance the sense of functionality.

In addition, a dual coil motor is used for the disk hand at 9 o'clock to improve the movement and functionality of the hand.

In addition to the alarm ON/OFF function and the rotating stopwatch, it also serves as a battery indicator.

The dial and buttons feature the high-contrast accent colors seen in aircraft cockpits, but the design is in functional dark colors.

The case, bezel, and band are made of biomass plastic, which is expected to reduce the burden on the environment.

Time correction via Bluetooth® connection ensures the time accuracy required for aviation missions, and solar power makes it practical.

GRAVITYMASTER embodies the worldview of professional aviation and the "longing for the sky," while supporting the relentless challenge to the limits.


- Shock-resistant construction
・ Tough Solar (solar charging system)
- 20 ATM water resistance
- Mobile Link function (function linkage via Bluetooth® communication with compatible mobile phones)
- Dual time (with home time swap function)
・Stopwatch (1 second, 24 hour, split)
- Timer (set unit: 1 minute, maximum set: 24 hours, measured in 1 second units)
・ Electronic alarm
- Battery indicator display - Power saving function (hands stop moving after a certain period of time in a dark place to save power)
- Fully automatic calendar
- Date and day of the week display
・ LED light (Super Illuminator, with afterglow function)
・ Operating time from full charge without solar power generation When using functions: Approximately 5 months When in power saving mode: Approximately 18 months * When not linked to a smartphone, it operates with normal quartz accuracy (average monthly difference of ±15 seconds)

112192
4549526373084 In Stock