G-Shock Gravitymaster GR-B300-1A4 Tough Solar Carbon Core Guard Black/Orange Pilot Watch

The G-Shock Gravitymaster GR-B300-1A4 is a purpose-built pilot watch from Casio's Master of G line, finished in a bold black and orange colorway and engineered for the demanding environments aviators and outdoor professionals face. It pairs a large-diameter analog dial with Casio's Tough Solar charging system and Bluetooth smartphone connectivity, delivering timekeeping that keeps working long after the flight is over.

Built around a Carbon Core Guard structure that fuses carbon material into the case for rigidity, shock resistance, and corrosion resistance, this Gravitymaster measures 59mm x 54.7mm x 15.7mm and is rated to 200 meters (20 bar) of water resistance. The screw-lock crown, recessed buttons, and triple-layer dial layout are all designed for intuitive reading and reliable operation, even with gloved hands or under cabin pressure changes at altitude.

Functions include world time across multiple time zones, a stopwatch, countdown timer, daily alarm, hourly time signal, full calendar, and a light for low-light use. Tough Solar keeps the movement powered from any light source, while Bluetooth links the watch to the Casio Watches app for automatic time adjustment and easy setting of alarms, world time, and other functions.

Whether you are logging flight time, working outdoors, or just want a no-nonsense everyday timepiece with genuine aviation DNA, the GR-B300-1A4 brings the durability and feature set G-Shock is known for in a striking black and orange package.