G-Shock GRB300-1A

G-Shock Gravitymaster Series Mens Watch GRB300-1A. Case size 59 x 54.7 with a thickness of 15.7mm. WR rating of 200m. G-Shock Toughsolar model. Shock resistant model with a carbon core guard structure. Mineral Crystal glass. Smartphone App connected model. Approximate weight of 70gm. 

Designed for the skies and built to withstand the extreme, the Casio G-Shock GRB300-1A Gravitymaster is the ultimate tool watch for aviation enthusiasts and adventurers. Designed with a bold, aviation-inspired look, this high-performance timepiece features a carbon core guard structure for enhanced strength and durability while maintaining a lightweight feel.

Packed with advanced features like Bluetooth® connectivity, world time and the ability to connect to a smartphone and automatically adjust the time, the GRB300-1A is ready for any mission. The large, easy-to-read display with Super Illuminator LED ensures visibility in all conditions, and its 200-meter water resistance makes it suitable for both sky and sea. With its black and red stealth design and cutting-edge tech, the G-Shock GRB300-1A Gravitymaster delivers the perfect combination of rugged functionality, precision, and style—making it a must-have for those searching for a premium aviation G-Shock watch in Australia.

The G-Shock Gravitymaster GRB300-1A is equipped with advanced smartphone connectivity features designed for seamless integration and enhanced functionality. Through the CASIO WATCHES app and Bluetooth® mobile link technology, users can enjoy automatic time adjustment for precision timekeeping wherever they go. Effortlessly manage watch settings directly from your smartphone, access data for approximately 300 world time cities, and keep track of flight paths with the flight log feature. The phone finder function adds convenience, helping you locate your smartphone with ease. Perfect for pilots, travelers, and tech-savvy users, the GRB300-1A ensures that your watch stays perfectly synced and packed with smart features to support your dynamic lifestyle. Ideal for adventurers, aviators and all in between.

Ships in 1-3 Business Days from Sydney with Australia Post Express. Sydney customers can pick up on the same day from our Alexandria showroom after placing the order by choosing Click & Collect as the delivery option. 

2 year Australian warranty from Shriro Australia. StarBuy are Authorised online and instore stockists of Casio G-Shock Watches. All Casio G-Shock Watches are shipped with local and an international manufacturers warranty and in G-Shock original packaging.

• How and when will my StarBuy order be shipped?
  We ship all orders via Australia Post Express for fast and reliable delivery. We aim to dispatch every order as quickly as possible—typically within 1–3 business days. You'll receive a confirmation email with tracking details as soon as your order ships.
  

• Can StarBuy guarantee delivery dates?
  While Australia Post Express is generally reliable, their delivery dates are estimates only and may vary, especially during busy periods. We appreciate your understanding if your parcel takes a little longer to arrive.
  

• Will I need to sign for my order?
  Yes, a signature is required upon delivery. If no one is home, we recommend using a work address. Australia Post may offer contactless delivery—in those cases, we follow their current safety protocols. Risk and ownership transfer to the recipient upon delivery.
  

• What if I am not home when my order arrives?
  If no one is available to sign, Australia Post will leave a card with details on how to collect your parcel from the closest authorised Australia Post Office. You’ll need to present a photo ID at the post office to pick it up. If you’ve authorised a Safe Drop with Australia Post previously, they’ll follow your existing instructions.
  

• Will I get a Shipping Notification?
  Absolutely! As soon as your order is on its way, you’ll receive an email with tracking details. We kindly ask for your patience—tracking updates may take up to 3 business days after ordering.
  

• What are your shipping charges?
  We offer free shipping Australia-wide with Australia Post Express. For approved brands shipped to New Zealand, a $10 flat fee will be added to your total at checkout. Approved parcels to NZ are shipped within the Australia Post / NZ Post network.
  

• Click & Collect?
  

  Prefer a quicker pick-up? Our Click & Collect service makes it easy.

  Pickup Location:
  StarBuy
  Suite 23, 112 McEvoy Street
  Alexandria NSW 2015 

  Hours:
  Monday–Friday: 10am–5pm
  Saturday: 9am–12pm  

  How it works - Your order will be ready for pickup within an hour during business hours (unless otherwise notified). If someone else is collecting on your behalf, just email us their name—they’ll need to show ID at pickup.

• Are all items in stock?

  StarBuy products for sale on the website are always live and accurate. All items marked ‘In Stock’ are physically in stock with us. Items marked ‘Out of Stock’ are completely sold out. In rare instances where additional items are ordered and the items are being shipped to StarBuy, a specific note will be made on the product page.
  
  

• How can I be sure your products are authentic?

  We guarantee that all of the products we sell on StarBuy

  1. Are brand new
  2. Are 100% genuine - manufactured by the named brands, in keeping with their high quality standards.

  The only thing that’s different are the low prices.
  
  

• Is a tax invoice included with my order?

  All orders have an automated invoice emailed to the email address on the order. All items listed on our website are GST inclusive. The invoice clearly shows the GST charged on the purchase as well as our name and ABN number.
  
  

• Can an item be reserved or put on hold?

  Unfortunately due to the model adopted by StarBuy, we are unable to reserve or put an item on hold. Items on sale are limited in quantity and often sell out quickly.
  
  

• Why are StarBuy prices low?

  StarBuy is a low cost discount website that buys items in bulk and offers them at the lowest possible prices. We keep our costs low by automating most back office processes to keep our prices world competitive. We ensure that you benefit by buying quality brands at low prices from StarBuy and come back to save money again and again.