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Casio G-Shock GRAVITYMASTER GRB300-1A | Pilot Watch | Tough Solar | Bluetooth® Flight Log | Dual Time | 200M Water Resistant

  • Based on 46 reviews
Condition: New
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$269.99 Why this price?
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Availability: Only 10 left in stock, order soon!
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Arrives Thursday, Oct 15
Order within 21 hours and 18 minutes
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Description

The G-SHOCK GRAVITYMASTER GRB300-1A is more than a pilot watch — it’s a mission-ready aviation instrument engineered for the skies. Designed with inspiration drawn directly from next-generation aircraft cockpits, this timepiece delivers rapid legibility, intuitive operation, and uncompromising toughness. Its triple-layer 3-D dial, bold indices, and large numerals allow pilots to read critical information at a glance, while the mode indicator dial and rotary battery-level display mirror the logic of cockpit instrumentation. The Carbon Core Guard structure, built from carbon materials used in aircraft fuselages, ensures elite shock resistance without unnecessary weight. Powered by Tough Solar and enhanced with Bluetooth® smartphone connectivity, the GRB300-1A automatically maintains precise timekeeping and records flight log data including date, time, and location, viewable on a smartphone map. Dual time, 200-meter water resistance, and a Super Illuminator LED complete a watch built for aviation professionals, travelers, and anyone who demands uncompromising performance. The GRAVITYMASTER GRB300-1A doesn’t just keep time — it keeps you mission-ready.

Package Dimensions ‏ : ‎ 4.41 x 3.86 x 3.78 inches; 7.76 ounces


Item model number ‏ : ‎ GR-B300-1ACR


Department ‏ : ‎ mens


Batteries ‏ : ‎ 1 C batteries required. (included)


Date First Available ‏ : ‎ May 13, 2024


Manufacturer ‏ : ‎ CASIO


Product Warranty: For warranty information about this product, please click here


Best Sellers Rank: #575,757 in Clothing, Shoes & Jewelry (See Top 100 in Clothing, Shoes & Jewelry) #2,653 in Men's Wrist Watches


#2,653 in Men's Wrist Watches:


Display: Analog


Watch Movement Type: Quartz


Additional Features: Alarm, Chronograph, Light Up, Perpetual Calendar


Power Source: Solar Powered


Strap Type: Adjustable


Water Resistance Depth: 200 meters


Sport Type: Fishing, Hiking, Walking


Clasp Type: Buckle


Water Resistance Level: Water Resistant


Embellishment Feature: Crystal


Closure Type: Buckle


Style Name: Modern


Shape: Round


Band Color: Black


Dial Color: Black


Theme: Aviation


Pattern: Solid


Face Style: modern


Brand Name: Casio


Model Name: G-Shock


Included Components: Crossbody Bag


Model Number: GR-B300-1ACR


Series Number: 300


Unit Count: 1 Count


Manufacturer: CASIO


Number of Items: 1


UPC: 889232373058


Age Range Description: Adult


Item Type Name: Sport Watch


Manufacturer Part Number: GR-B300-1ACR


Band Material Type: Bio-based resin


Case Material Type: Resin


Crystal: Mineral Glass


Case Diameter: 5.9 centimeters


Band Width: 28 millimeters


Case Thickness: 15.7 millimeters


Band Length: 1 inches


Bands: 1


Warranty Type: Limited


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Oct 15

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • G Shock…nothing else to say!
Love the watch…as always, great time piece! Looks amazing!
Reviewed in the United States on June 22, 2026 by Steve

  • Excellent watch
Great style. Looks great
Reviewed in the United States on May 17, 2026 by Anthony T.

  • Not worth the purchase
Garbage, after only 3 months the buckle on the band broke. Casio will not cover the band and Amazon will not take it back or replace. A new band with shipping is $100.00. Piss poor product and Piss poor customer service.
Reviewed in the United States on December 15, 2025 by Diane Chiappetta

  • The Perfect Watch
Perfect watch for my needs.
Reviewed in the United States on April 12, 2026 by Se7en26

  • Casio
I like the model and fitting but light inside could be better
Reviewed in the United States on July 18, 2026 by Avashesh pratap singh

  • Great watch!!
Great watch!! Easy to read.
Reviewed in the United States on March 15, 2026 by Pedro For President

  • Fiel a la imagen y características
Muy bonito, me gusta q carga con luz solar. Tamaño perfecto
Reviewed in the United States on February 21, 2026 by lilian castañeda

  • A pain to set.
Very difficult to set. The watch is well made but extremely frustrating too figure out. The directions only come in Japanese.
Reviewed in the United States on July 29, 2026 by Anthony Sbiroli

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