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The Grand Seiko Hi-Beat Diver SBGH255 stands out as a professional luxury watch in the realm of dive watches. Made with Grand Seiko’s “high intensity” titanium, it boasts a water resistance of up to 600 meters and features a Zaratsu manually applied finish on the case for a sleek look. With a 46.9mm titanium case and a black dial, this watch offers a comfortable and stylish wear. The cathedral-style hands, soft iron dial for anti-magnetic properties, and yellow gold accents add to its aesthetic appeal. Internally, the watch houses Grand Seiko’s 9S85 automatic movement, which exhibits 36,000 vibrations per hour and a 55-hour power reserve. This outstanding timepiece is perfect for diving enthusiasts and watch connoisseurs who seek a durable and accurate watch.

The Grand Seiko Hi-Beat Diver SBGH255 sets itself apart from the competition, including the Rolex Sea-Dweller, by offering top-notch features and craftsmanship. Equipped with a 5hz automatic movement and a 55-hour power reserve, this dive watch delivers optimal precision and reliability. The titanium case, bracelet, and clasp make it comfortable to wear, while the diving clasp with a dive extension allows for easy adjustment. Boasting a deep knurled bezel with a dlc insert, this watch ensures excellent grip and durability. With its outstanding water resistance, anti-magnetic properties, and impeccable timing tolerances, the Grand Seiko Hi-Beat Diver SBGH255 proves itself as a superior luxury watch in the diving realm.



The Grand Seiko SBGH255 is a timepiece that boasts an impressive array of specifications. One of its standout features is its 5hz automatic movement, which ensures accuracy and precise timekeeping. With a high frequency of 5 beats per second, this movement allows for smoother and more fluid motion of the watch hands.

In addition, this timepiece also offers a generous 55-hour power reserve. This means that once fully wound, the watch can continue to run for 55 hours without needing to be rewound. This is particularly convenient for those who may not wear their watch every day, as it ensures that the watch will still be functioning when it is next worn.

The case of the Grand Seiko SBGH255 is made from high intensity titanium, a material known for its strength and durability. Titanium is not only extremely lightweight, but it also offers excellent resistance to corrosion, making it a perfect choice for a dive watch. The case measures 46.9mm in diameter, providing a substantial presence on the wrist.

Speaking of diving, this timepiece is water-resistant up to an astounding 600 meters. This makes it suitable for professional divers who require a watch that can withstand the pressures of deep-sea exploration. Whether you’re diving to great depths or simply swimming, you can be confident that this watch will remain fully functional and secure on your wrist.

The Grand Seiko SBGH255 features a Zaratsu manually applied finish, which is a traditional Japanese technique of polishing. This creates a beautifully smooth and reflective surface, giving the watch a luxurious and refined appearance. The black dial adds a touch of sophistication, while the titanium bracelet complements the overall design, offering both comfort and style.

As for its functions, this timepiece includes hours, minutes, seconds, and a date display. The simplicity of its design allows for easy readability and ensures that the watch remains versatile and suitable for various occasions.

Design and Comfort

When it comes to design and comfort, the Grand Seiko SBGH255 excels on multiple levels. Its ergonomic design ensures a comfortable fit on the wrist, making it a joy to wear for extended periods. Whether you’re working or playing sports, you will appreciate the watch’s comfortable feel and lightweight construction.

If you have a smaller wrist, you may have struggled to find a watch that fits properly. However, the Grand Seiko SBGH255 is suitable for small wrists, as its case diameter of 46.9mm strikes the perfect balance between size and wearability. You no longer have to worry about a watch overpowering your wrist or feeling uncomfortable due to its size.

Another feature that adds to the comfort of wearing this timepiece is its diving clasp with dive extension. The clasp allows for easy adjustment of the bracelet’s length, ensuring a secure and personalized fit. The dive extension is particularly useful for divers, as it allows for quick and easy adjustment of the bracelet to fit over a wetsuit.

The over-engineered clasp of the Grand Seiko SBGH255 is truly a testament to the watch’s craftsmanship. With its trigger release and clamshell lock, the clasp provides a secure and reliable closure, ensuring that the watch remains firmly attached to your wrist at all times. You can dive with confidence, knowing that your watch is securely fastened.

For divers or those who require additional grip, the Grand Seiko SBGH255 features deep knurling on its bezel. This textured surface allows for easy grip when manipulating the bezel, even when wearing gloves or in wet conditions. The bezel also boasts a DLC (Diamond-Like Carbon) insert, offering enhanced durability and resistance to scratches.

Another impressive feature of this timepiece is its soft iron dial, which provides anti-magnetic properties. Magnetism can negatively affect the accuracy of a watch, but with the soft iron dial, the Grand Seiko SBGH255 is protected from magnetic fields, ensuring reliable timekeeping regardless of the environment.

In terms of aesthetics, the Grand Seiko SBGH255 does not disappoint. It features richly appointed appliques and yellow gold accents, adding a touch of elegance and luxury to the overall design. Additionally, the watch showcases cathedral-style hands, which are not only visually striking but also make it easy to read the time at a glance.


The Grand Seiko SBGH255 is powered by the Grand Seiko 9S85 automatic movement, a calibre known for its precision and reliability. With a high frequency of 36,000 vibrations per hour, this movement ensures accurate timekeeping, with each second seamlessly transitioning into the next.

The movement also offers a 55-hour power reserve, providing ample time for the watch to continue running even when not worn or wound. This is especially convenient for those who may alternate between multiple watches or for occasions when the watch is not worn consistently. With a power reserve of 55 hours, you can confidently rely on the Grand Seiko SBGH255 to keep time accurately and reliably.

To further enhance its precision, the movement of the Grand Seiko SBGH255 is adjusted in six positions. This meticulous attention to detail ensures that the watch is finely tuned and calibrated, resulting in greater accuracy and performance. Whether you’re navigating the depths of the ocean or attending an important business meeting, you can trust that your watch will keep time with unparalleled precision.

The Grand Seiko SBGH255 also features hacking seconds and a quick-set date function. Hacking seconds means that the second hand stops when the crown is pulled out, allowing for precise time synchronization. The quick-set date function allows for easy adjustment of the date display, ensuring that you can change the date with minimal effort and hassle.

Dive Features

For those who enjoy exploring the depths of the ocean, the Grand Seiko SBGH255 offers an array of dive features that are both practical and reliable. It is designed to be helium resistant, ensuring that helium gas does not penetrate the watch during deep-sea diving. This feature is particularly useful for professional divers who spend extended periods in decompression chambers.

The Grand Seiko SBGH255 also features a double-sided resistance system, which enhances its ability to withstand high pressure and extreme conditions underwater. This added durability and resilience make the watch an excellent choice for divers who demand a timepiece that can withstand the rigors of the deep sea.

When it comes to timing accuracy, the Grand Seiko SBGH255 delivers exceptional performance. It has timing tolerances of -3 to +5 seconds per 24 hours, which is a remarkable achievement for a mechanical watch. Whether you’re timing your dive or need precise timing for any other activity, this watch’s accuracy will not disappoint.


The Grand Seiko SBGH255 is a timepiece that combines exceptional craftsmanship, precision engineering, and undeniable beauty. With its impressive array of specifications, thoughtful design, and dive features, this watch is a true testament to the Grand Seiko legacy.

From the high intensity titanium case to the comfortable fit and luxurious feel, every detail of the Grand Seiko SBGH255 has been meticulously crafted to ensure a superior timekeeping experience. Whether you’re a professional diver in search of a reliable companion or a discerning watch enthusiast, this timepiece is sure to exceed your expectations.

With its 5hz automatic movement, 55-hour power reserve, and fantastic diving capabilities, the Grand Seiko SBGH255 is an embodiment of precise timekeeping and exceptional performance. Its design and comfort make it suitable for various wrist sizes and occasions, while its movement and dive features guarantee reliable performance in any environment.

When you invest in the Grand Seiko SBGH255, you’re not just acquiring a timepiece but also becoming part of a legacy of excellence. Grand Seiko’s commitment to craftsmanship and innovation is evident in every aspect of this watch, making it a worthy addition to any watch collection.

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