Casio G-SHOCK GRAVITYMASTER GR-B300-8A2JF Solar Watch
Casio G-SHOCK GRAVITYMASTER GR-B300-8A2JF Solar Watch
The Casio G-SHOCK GRAVITYMASTER GR-B300-8A2JF is a fully analog solar watch from the aviation-focused MASTER OF G collection. This Japanese-market reference combines a gray exterior and dark dial with light-blue accents inspired by aircraft head-up displays.
Its Carbon Core Guard structure provides shock resistance while keeping the weight to 71 g. The three-dimensional dial features raised markers, large luminous hands and a rotary disc indicator at 9 o’clock. Mineral glass, a screw-lock crown and a bio-based resin strap complete the durable construction.
Tough Solar charging provides approximately five months of operation from a full charge without further light, extending to approximately 18 months in power-saving mode. Bluetooth connectivity through the CASIO WATCHES app supports automatic time correction, world-time settings, Flight Log and Phone Finder. The watch also includes dual time, a stopwatch, countdown timer, daily alarm and 200-metre water resistance.
Key Features
Tough Solar quartz movement with Casio module 5719
Shock-resistant Carbon Core Guard construction
Fully analog, multi-layer dark dial with light-blue accents
Bluetooth Mobile Link through the CASIO WATCHES app
Dual time, Flight Log, stopwatch, timer and daily alarm
Mineral glass and screw-lock crown
Bio-based resin strap with buckle fastening
20-bar water resistance and up to 18 months of power-saving operation
Specifications
Specification | Details |
Brand | Casio G-SHOCK |
Model / Reference | GR-B300-8A2JF |
Collection / Series | MASTER OF G — GRAVITYMASTER |
Movement | Tough Solar quartz |
Module | 5719 |
Movement Type | Solar-powered quartz |
Case Material | Carbon, bio-based resin and stainless-steel components |
Case Size | 59.0 × 54.7 mm |
Case Thickness | 15.7 mm |
Crystal | Mineral glass |
Dial Color | Dark gray/black with light-blue accents |
Dial Details | Multi-layer analog dial with raised markers, Neobrite hands and markers, and rotary disc indicator |
Bracelet / Strap | Bio-based resin strap |
Clasp / Buckle | Buckle |
Water Resistance | 20 bar / 200 metres |
Functions | Bluetooth Mobile Link, automatic time correction, dual time, world time, Flight Log, Phone Finder, 1-second stopwatch, 24-hour countdown timer, daily alarm, full automatic calendar, battery-level indicator, hand-position correction, power saving and Super Illuminator |
Power Reserve | Approximately 5 months without further light; approximately 18 months with power saving |
Accuracy | Average ±15 seconds per month without smartphone connection |
Crown | Screw-lock crown |
Wrist Fit | Approximately 145–215 mm |
Weight | 71 g |
Release Date | May 17, 2024 |
Original Japanese Retail Price | ¥49,500 including tax |
International Buyers – Import Duties Notice:
Be informed that import duties, taxes, and charges are not included in the item price or shipping cost. These are the buyer's responsibility.
All items are shipped via EMS Japan post or DHL fully insured signed for delivery. I wrap items very well and post very fast most items are posted within 3 days of purchase
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