Casio G-Shock GR-B300H-5A gold watch
Casio G-Shock GR-B300H-5A gold watch
Casio G-Shock GR-B300H-5A gold watch
Casio G-Shock GR-B300H-5A gold watch

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G-SHOCK GR-B300H-5A

$330.00
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A Gravitymaster with a sapphire crystal and a flight log.

The GR-B300 is a large Gravitymaster with Tough Solar power, a sapphire crystal, Bluetooth phone link and a Flight Log that records locations to your phone.

Our take

Built for pilots, but the look works anywhere. It is big at 59 mm, so check the case size.

Know before you buy

Case: 59 × 54.7...

  • Sku: GRB300H-5A
  • Available: Available to order
  • Vendor: G-Shock
Usually ships within 7–10 business days.
Casio G-Shock GR-B300H-5A gold watch
G-SHOCK GR-B300H-5A
$330.00

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A Gravitymaster with a sapphire crystal and a flight log.

The GR-B300 is a large Gravitymaster with Tough Solar power, a sapphire crystal, Bluetooth phone link and a Flight Log that records locations to your phone.

Our take

Built for pilots, but the look works anywhere. It is big at 59 mm, so check the case size.

Know before you buy

Case: 59 × 54.7 × 15.7 mm. Water resistance: 200 meters. Crystal: sapphire crystal.

Open Technical Data for the full dimensions and materials, or Features for the function list.

<Casio G-Shock GR-B300H-5A gold watch

  • Collection: MASTER OF G - AIR
  • Case Size: 59 × 54.7 × 15.7 mm
  • Weight: 71 g
  • Case Material: Carbon / resin / bio-based resin
  • Bezel Material: Resin / bio-based resin
  • Strap Material: Resin / bio-based resin
  • Shock Proof: Shock Resistant (Carbon Core Guard)
  • Water Resistance: 200 meters
  • Glass Material: Sapphire crystal
  • Power Supply: Tough Solar (rechargeable)
  • Compatible Band Size: 145 to 215 mm
  • Other: Neobrite

Casio G-Shock GR-B300H-5A gold watch

  • Analog display with dual time
  • Tough Solar power with battery level indicator and power save
  • Bluetooth Mobile Link with the Casio Watches app: auto time correction, auto DST, phone finder, world time (about 300 cities)
  • Flight Log
  • Stopwatch: 1-second unit, up to 23:59'59''
  • Countdown timer: 1-second unit, up to 24 hours
  • 1 daily alarm
  • LED light with Super Illuminator
  • Full auto-calendar (to year 2099)

Casio G-Shock GR-B300H-5A gold watch

G-SHOCK, the watch that brought the new concept of toughness to the timepiece.
It began with a reckless challenge to the conventional wisdom of the day, a developer’s belief that it was possible to construct a watch that wouldn’t break, even if dropped. Project Team Tough was formed to build it in 1981.
The team created over 200 prototypes one after another over a period of about two years. They finally arrived at a shock-resistant structure. This marked the birth of a technology that is tough to the core.
And G-SHOCK has continued its unceasing evolution ever since, in pursuit of greater toughness in every respect, from structure and materials to functions. Today, the development team’s passion for challenge and constant efforts have reached fruition in Triple G Resist, a structure with the strength to withstand 3 types of gravitational acceleration.

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