The G-SHOCK GR-B300RY-1A9ER men's watch from the Master Of G Premium series is a unique model that combines modern technology with functionality. Its black-colored envelope is made of durable plastic, which offers lightness and resistance to damage. The dial of the watch is multicolored, which gives it a dynamic character, and it is covered by mineral glass. The watch features a wide 55mm envelope, making it clear and easy to read. The green-colored rubber strap offers wearing comfort and a good grip on the wrist. The watch is waterproof to 200 meters, making it ideal for swimming and diving. In addition, the watch is equipped with functions such as a stopwatch and a backlight, adding to its functionality. The G-SHOCK GR-B300RY-1A9ER is an excellent choice for men who appreciate modern design and practicality.
Functions
Bluetooth® Smart
The watch is equipped with energy-saving Bluetooth® technology, which offers power-saving data transfer at the push of a button. The watch can connect to a smartphone wirelessly via Bluetooth®, enabling access to a wide range of useful functions.
Super-Illuminator
At the touch of a button, the display can be brightly illuminated in a fashionable color
Shock-resistant
Shock-resistant construction protects against impact and vibration.
Solar Power
A solar cell provides power for operation.
Neo-display
A luminous coating provides long-term illumination in the dark after only a short exposure to light.
World time function
Displays the current time in major cities and specific areas around the world.
Dual Time Display
Dual Time simultaneously displays the time in two different time zones.
Date and weekday display
The current day and weekday are both displayed.
Stopwatch function - 24 hours
Elapsed times are measures with split-second accuracy. The watch can measure times of up to 24 hours.
Timer - 1/1 min. - 24 hours
For fans of precision: the countdown timers help you to remember specific or recurring events by giving off an audible signal at a preset time. The time can be set to the nearest seconds and up to 24 hours in advance. This model has three independent timers - ideal for people who need to take medicines every day or those who do interval training.
Daily alarm
The daily alarm reminds you of events that recur every day, by emitting an audible signal at the set time.
Crown button lock
Secures the crown button from accidental change to another mode of operation.
Smart Access Technology
Smart Access makes it easy to operate CASIO’s watches. Pulling out and rotating the crown provides intuitive control over various functions.
Phone Finder
Misplaced your smartphone? All it takes is the push of a button on your watch and the smartphone sounds an alarm.
Flight Log Memory
The product is equipped with Flight Log Memory.
Mineral glass
The tough mineral glass resists damages.
Folding clasp
The watch has a folding clasp.
Battery level indicator
An indicator shows the current battery level.
Water resistance classification (20 bar)
Perfect for free diving without scuba gear: the watch is water resistant up to 20 bar according to ISO 22810.
What’s in the box?
3-year warranty
User manual
Warranty card
Casio box
Reviews about G-SHOCK Master Of G Premium GR-B300RY-1A9ER (6)
I’m very happy with it. For years, this model has been synonymous with reliability and a modern take on sporty style. Its appearance is impressive; the watch looks very sturdy and goes great with everyday outfits. I’m impressed by the craftsmanship and the well-thought-out design. It sits comfortably on the wrist and is easy to adjust to your needs. Picking it up in person in Warsaw was a big plus; I was able to inspect the product on-site before finalizing the purchase. Everything went very smoothly; the staff at the store were friendly and professional, which further enhanced my positive shopping experience. It’s a great choice for any guy who likes to have something sturdy on his wrist and values comfort while wearing it. I have no hesitation in recommending both the store and the watch itself to all my friends.
KubaGóral
2/6/26
100%
I was looking for a watch from the Master Of G series, and this model stands out primarily for its solar power, which eliminates the need to replace the battery. The 55-mm case is very large and substantial, but thanks to its plastic construction, the watch remains relatively lightweight. A very interesting feature is the combination of the black case with a green rubber strap and a multicolored dial, which gives it a modern look. The watch features Bluetooth connectivity, which makes it easy to sync the time with a smartphone and access additional features. In the dark, the powerful Super-Illuminator backlight and the Neobrite coating on the hands come in very handy. As befits a G-Shock, the model is shock-resistant and water-resistant up to 200 meters, so I take it to the pool without any worries. Although the product was out of stock for a while, I signed up for email notifications and managed to buy it at a promotional price. The store offers free returns for up to 100 days and a 3-year warranty with the option to extend it, which provides great peace of mind when purchasing such an advanced model.
KaraBandi
1/23/26
100%
Great quality, fast turnaround.
<3
12/5/24
100%
Super-fast shipping—I recommend them with a clear conscience.
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The administrator of your personal data is the owner of the Watchard store, i.e. 57 Concepts Sp. z o.o. Sp. k. with the registered office at al. Witosa 31, lok. 115, 00-710 Warsaw, Poland. Providing personal data by the Customer is voluntary but necessary to complete the purchase. You have the right to view your personal data we have processed, as well as the right to request changes or removal of your personal data. Personal data will be processed for a period of 10 years.
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The administrator of your personal data is the owner of the Watchard store, i.e. 57 Concepts Sp. z o.o. Sp. k. with the registered office at al. Witosa 31, lok. 115, 00-710 Warsaw, Poland. Providing personal data by the Customer is voluntary but necessary to complete the purchase. You have the right to view your personal data we have processed, as well as the right to request changes or removal of your personal data. Personal data will be processed for a period of 10 years.
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