*PRE-ORDER* Casio G-Shock Master of G Air Gravitymaster Master in Horizon Gold Bluetooth Solar Watch - GR-B300H-5A

*PRE-ORDER* — Expected delivery week of November 8, 2026.

The Casio G-Shock GR-B300H-5A is a Master of G Air Gravitymaster pilot watch in the "Master in Horizon Gold" colorway, pairing a light yellow gold ion-plated metal bezel and brown ion-plated accents with a dark brown bio-based resin band. It uses a shock-resistant Carbon Core Guard structure with Tough Solar power and Bluetooth smartphone link.

Key facts
Brand: Casio G-Shock
Collection: Master of G - Air (Gravitymaster)
Reference: GR-B300H-5A
Case material: Bio-based carbon-reinforced resin with stainless steel bezel (light yellow gold ion plating)
Case size: 59 x 54.7 x 15.7 mm
Weight: 71 g
Band: Dark brown bio-based resin
Glass: Mineral glass
Power: Tough Solar (approx. 5 months in normal use, up to 18 months in power saving)
Time sync: Bluetooth smartphone link for automatic time adjustment
Water resistance: 200 m (20 bar)
Functions: Dual time, 1-second stopwatch, countdown timer, daily alarm, LED light, full auto-calendar to 2099, battery level indicator
Construction: Carbon Core Guard shock resistance, screw-lock crown, Neobrite, accuracy +/-15 seconds per month

Frequently Asked Questions

Is this watch new and authentic?
Yes — every watch we sell is 100% brand new and authentic, sourced directly from authorized channels.

What's included in the box?
The watch ships in its original manufacturer box with all accompanying papers/warranty card.

When will this pre-order ship?
Expected delivery is the week of November 8, 2026. We'll notify you as soon as it's ready to ship.

What is the warranty?
This watch comes with the full manufacturer's international warranty.