Expand your horizons with a MASTER OF G — designed for pros working in the toughest of environments. Take the first step in a journey of endless exploration with the MASTER IN HORIZON GOLD, inspired by the golden horizon where earth meets sky. This is one tough watch built to deliver with refined style and rugged performance.

The design features a metal bezel finished in light yellow gold ion plating and key metal components accented with brown ion plating. Paired with a dark brown resin band, these timepieces project the awe-inspiring power of nature.

The GR-B300H-5A employs a shock-resistant Carbon Core Guard structure with carbon fiber-reinforced resin case and seamless bezel design inspired by next-generation aircraft, coming together in a bold and powerful form. Dual-time instantly switches between the time back home and local time, a practical function to make traveling abroad that much smoother. The large, raised indexes and metal bezel accentuating the large watch face enhance the visibility and functionality so important for pilots, whose job demands intuitive reading of time. The rotary disc indicator at the 9 o’clock position is driven by a dual-coil motor to ensure smooth rotation and functional beauty, rotates to display alarm on/off status, serves as stopwatch, and also functions as a battery level indicator.

Case / bezel material: Bio-based Carbon / Bio-based resin / Stainless steel
Light yellow gold ion plated bezel
Bio-based resin band
Mineral Glass
Neobrite
Shock Resistant
Carbon Core Guard structure
Screw Lock Crown
200-meter water resistance
LED light (Super Illuminator)
Afterglow
LED:White
Tough Solar (Solar powered)
Mobile link (Wireless linking using Bluetooth®)
Dual time (Home City time swapping)
1-second stopwatch
Measuring capacity: 23:59'59.
Measuring modes: Elapsed time, split time
Countdown timer
Measuring unit: 1 second
Countdown range: 24 hours
Countdown start time setting range: 1 minute to 24 hours (1-minute increments and 1-hour increments)
Daily alarm
Battery level indicator
Power Saving (hands stop to save power when the watch is left in the dark)
Full auto-calendar (to year 2099)
Date display
Day indicator
Regular timekeeping:
Analog: 3 hands (hour, minute (hand moves every 10 seconds), second), 3 dials (dual time hour and minute, dual time 24-hour, day)
Accuracy: ±15 seconds per month (with no mobile link function)
Approx. battery operating time:
5 months on rechargeable battery (operation period with normal use without exposure to light after charge)
18 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)
Size of case : 59 × 54.7 × 15.7 mm
Total weight : 71 g