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    Description

       Casio G-SHOCK GR-B300H-5AJF is a GRAVITYMASTER model from the MASTER OF G - AIR series and the MASTER IN HORIZON GOLD group. This Japanese-market reference combines Tough Solar power, Bluetooth Mobile Link, Carbon Core Guard construction, a dark brown resin band, and light yellow-gold IP bezel detailing. Casio Japan lists the model for August 2026.

    Key Features

    • Tough Solar solar charging system
    • Bluetooth Mobile Link with the CASIO WATCHES smartphone app
    • Automatic time adjustment through a compatible smartphone
    • Dual Time with Home Time swapping
    • Approximately 300 world-time cities available through the app
    • Flight Log and Phone Finder functions
    • Carbon Core Guard structure
    • Shock-resistant construction
    • 20-bar water resistance
    • 24-hour stopwatch with split timing
    • 24-hour countdown timer
    • Time alarm
    • Full auto calendar with date and day display
    • LED Super Illuminator with afterglow
    • Neobrite luminous treatment
    • Power-saving function and battery indicator

    Specifications

    Brand: Casio
    Collection: G-SHOCK MASTER OF G - AIR / GRAVITYMASTER
    Model Number: GR-B300H-5AJF
    Module: 5719
    Display: Analog
    Power Source: Tough Solar solar charging system with rechargeable secondary battery
    Rechargeable Battery: CTL920
    Accuracy: Average ±15 seconds per month when smartphone time adjustment is unavailable
    Operating Time: Approximately 5 months from full charge without further light exposure under normal stated usage; approximately 18 months with power saving
    Bluetooth: Yes
    Smartphone Link: CASIO WATCHES Mobile Link
    Crystal: Mineral glass
    Case Material: Carbon fiber reinforced resin using biomass plastic
    Case/Bezel Materials: Carbon fiber reinforced resin, resin, and stainless steel
    Band Material: Biomass resin
    Band Color: Dark brown
    Case Dimensions: 59 × 54.7 × 15.7 mm
    Weight: 71 g
    Compatible Wrist Size: 145–215 mm
    Water Resistance: 20 bar
    Bezel Finish: Light yellow-gold IP on the bezel; brown IP accents are also used on the model
    Calendar: Full auto calendar
    Release Information: August 2026, Casio Japan

    Condition

    Seller default condition profile: New with tags.                                
                                        

                                  

     

     

    Shipping

       Shipping Information

     Fast, reliable, fully tracked, and insured delivery via DHL or FedEx or UPS


     In some cases, Japan Post EMS SpeedPost may be used depending on your location.

     All customs forms are correctly included.

    Import duties or taxes may apply depending on your country?s regulations.

     Items are professionally packed to ensure safe international shipping.

     A tracking number will be provided as soon as your order has shipped.




      



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