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2021 Omega Seamaster 300 Review

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The “2021 Omega Seamaster 300 Review” explores the features and specifications of the Omega Seamaster 300 watch. This timepiece is encased in 41mm of stainless steel and features a blue dial on a stainless steel bracelet. It includes hours, minutes, and seconds functionality and measures 14mm in thickness and 48.1mm from lug-to-lug. The review also highlights the modifications made in the second generation of this watch, including a cambered sapphire, anodized aluminum bezel insert, and changes in the dial design. For a comprehensive understanding of the timepiece, viewers are directed to watch the full review by Tim Mosso.

For more details on luxury watches and to explore the latest pre-owned luxury watch arrivals, visit The article emphasizes reaching out to Team Mosso directly for pricing and availability inquiries, showcasing their commitment to customer satisfaction and ensuring a seamless purchasing experience. The 2021 Omega Seamaster 300 emerges as a stylish and reliable choice for watch enthusiasts, with its refined design and notable features setting it apart in the luxury watch market.



The case of the watch is a crucial element of its overall design. In the case of the Seamaster 300, it is crafted from high-quality stainless steel, giving it a sturdy and durable feel. The shape of the case is elegant and timeless, with sleek lines and a polished finish. The combination of the steel construction and the design of the case make the Seamaster 300 a versatile timepiece that can be worn in both formal and casual settings.


The dial of the Seamaster 300 is one of its most notable features. It is beautifully designed, with a clean and minimalist aesthetic. The dial is available in a range of colors, allowing you to choose the one that best suits your personal style. The hour markers are applied, giving the dial a three-dimensional depth that adds to its visual appeal. Overall, the dial of the Seamaster 300 is both functional and aesthetically pleasing, making it a joy to read the time at a glance.


The bezel of the Seamaster 300 is an essential component of its design and functionality. It is unidirectional, allowing for precise timing of dives and other activities that require accurate timekeeping. The bezel is made from ceramic, a material known for its scratch resistance and durability. The design of the bezel is sleek and modern, with a lustrous finish that complements the overall aesthetics of the watch. Whether you are using the bezel for diving or simply as a visual element, it adds a touch of sophistication to the Seamaster 300.


The bracelet of the Seamaster 300 is crafted with the same attention to detail as the rest of the watch. It is made from high-quality stainless steel, ensuring its longevity and durability. The design of the bracelet is ergonomic, with a comfortable fit that is suitable for extended wear. The links are polished and have a brushed finish, adding to the overall aesthetic appeal of the watch. The bracelet is also adjustable, allowing you to find the perfect fit for your wrist.


The clasp of the Seamaster 300 is designed with both functionality and security in mind. It is equipped with a folding clasp, which ensures that the watch stays securely on your wrist at all times. The clasp also features a push-button release, making it easy to put on and take off the watch. Additionally, the clasp is engraved with the Omega logo, adding a subtle touch of luxury to the overall design of the watch.


The luminosity of the Seamaster 300 is exceptional, thanks to the high-quality loom used on the dial. The hour markers and hands are coated with Super-LumiNova, a luminescent material that glows in the dark. This allows for easy readability of the watch, even in low-light conditions. The loom on the Seamaster 300 is long-lasting, ensuring that the luminosity of the watch remains strong for years to come.


Caliber 8912

The Seamaster 300 is equipped with the innovative Caliber 8912 movement. This self-winding movement is manufactured in-house by Omega, ensuring its exceptional quality and precision. It features a Co-Axial escapement, which reduces friction and enhances the accuracy of the watch. The movement also has a free sprung-balance, which helps to improve its stability and resistance to external factors such as shocks and magnetic fields. The Caliber 8912 movement is a testament to Omega’s commitment to excellence in watchmaking.


The Caliber 8912 movement of the Seamaster 300 boasts several impressive features. It has a hacking seconds function, which allows for precise time setting. The movement also has a date function, displayed in a window at the 6 o’clock position on the dial. Additionally, the movement has a power reserve of approximately 60 hours, ensuring that the watch will continue to run smoothly even if not worn for a couple of days. These features contribute to the overall functionality and convenience of the Seamaster 300.


One of the key advantages of the Caliber 8912 movement is its exceptional accuracy. The movement is tested and certified by COSC, the official Swiss chronometer testing institute. This certification guarantees that the watch meets strict accuracy standards, with a maximum deviation of -4 to +6 seconds per day. This level of precision ensures that the Seamaster 300 will always display the correct time, allowing you to rely on it for both everyday wear and special occasions.

Power Reserve

The power reserve of the Seamaster 300 is an impressive feature that provides added convenience to the wearer. With a power reserve of approximately 60 hours, the watch can continue to function for up to two and a half days without needing to be wound or worn. This is particularly useful for those who rotate their timepieces or have a collection of watches, as it eliminates the need to constantly reset and wind the watch when not in use. The power reserve of the Seamaster 300 ensures that it will always be ready to wear whenever you need it.


The Caliber 8912 movement of the Seamaster 300 undergoes rigorous testing and certification to ensure its exceptional quality and reliability. In addition to the COSC certification for its accuracy, the movement is also tested for its magnetic resistance, water resistance, and overall performance. It is certified as a Master Chronometer by METAS, the Swiss Federal Institute of Metrology. This certification guarantees that the watch meets or exceeds the highest standards of precision, performance, and magnetic resistance. With its Master Chronometer certification, the Seamaster 300 is a timepiece that you can trust to deliver exceptional performance in any situation.

Water Resistance

The Seamaster 300 is a watch that is built for adventure, and as such, it offers impressive water resistance capabilities. With a water resistance rating of 300 meters, the watch is suitable for recreational diving, swimming, and other water-related activities. The case is sealed with gaskets and the crown is screw-down, ensuring that no water can penetrate the interior of the watch. Additionally, the bezel is designed to resist water ingress, further enhancing the water resistance of the Seamaster 300. Whether you are exploring the depths of the ocean or simply taking a dip in the pool, you can trust the Seamaster 300 to withstand the water pressure and keep running smoothly.


41mm diameter

The diameter of the Seamaster 300 case measures 41mm, making it a versatile size that can be worn comfortably by individuals with different wrist sizes. The 41mm diameter strikes a balance between being neither too large nor too small, making it suitable for both men and women. The size is ideal for those who prefer a slightly larger watch that makes a statement on the wrist, without being overpowering or cumbersome.

14mm thickness

The thickness of the Seamaster 300 measures 14mm, giving it a substantial and robust appearance. This thickness adds to the overall durability and sturdiness of the watch, as well as providing a solid feel on the wrist. Despite its thickness, the watch remains comfortable to wear, thanks to its ergonomic design and well-balanced proportions.

2021 Omega Seamaster 300 Review

48.1mm lug-to-lug

The lug-to-lug measurement of the Seamaster 300 is 48.1mm, which refers to the distance between the lugs on either side of the case. This measurement is important as it determines how the watch sits on the wrist. The 48.1mm lug-to-lug measurement of the Seamaster 300 ensures that the watch will fit comfortably on a range of wrist sizes, from smaller to larger. It also helps to create a balanced and proportional look when worn.


Original Seamaster 300

The Seamaster 300 has a rich history that dates back to its original release in 1957. The first Seamaster 300 was specifically designed for professional divers and featured a robust and reliable construction. It quickly gained a reputation for its exceptional water resistance and accuracy, making it a favorite among the diving community. The original Seamaster 300 set a new standard for dive watches and laid the foundation for the iconic Seamaster collection that we know today.

Second-generation Seamaster 300

Building upon the success of the original model, Omega introduced the second-generation Seamaster 300 in 2014. This updated version retained the key design elements that made the original so popular, while incorporating modern features and technology. The second-generation Seamaster 300 featured an improved movement, increased water resistance, and a range of new dial and bezel options. It was a testament to Omega’s commitment to innovation and continuous improvement in watchmaking.


Sapphire Crystal

One of the notable modifications to the Seamaster 300 is the use of a sapphire crystal. In earlier iterations, the watch featured a hesalite crystal, a type of plastic that offered good impact resistance but was prone to scratching. The introduction of a sapphire crystal greatly improves the scratch resistance of the watch, ensuring that it will retain its pristine appearance even after years of wear.

Bezel Insert

Another modification that has been made to the Seamaster 300 is the use of a ceramic bezel insert. The earlier models featured aluminum or steel inserts, which were more susceptible to scratches and fading. The introduction of a ceramic insert not only enhances the scratch resistance of the bezel but also provides a more luxurious and modern look, elevating the overall aesthetics of the watch.

Dial Design

The dial design of the Seamaster 300 has also undergone some modifications over the years. While the original models featured a more traditional dial design with printed hour markers, the current models feature applied hour markers, giving the dial a more premium and three-dimensional look. This modification adds to the overall elegance of the watch and enhances its readability.


The font used on the dial of the Seamaster 300 has been updated to a more modern and refined style. The new font is clean, legible, and better aligned with the overall aesthetics of the watch. This modification improves the overall readability of the dial and contributes to a more cohesive and contemporary design.

Sandwich Dial

In some special editions of the Seamaster 300, a sandwich dial has been introduced. This dial design features cutout hour markers that allow the luminous material to shine through from underneath. This creates a striking visual effect and adds a touch of uniqueness to the watch. The sandwich dial modification is a testament to Omega’s commitment to pushing the boundaries of design and offering collectors something truly special.

Less Printing on Dial

In recent versions of the Seamaster 300, Omega has reduced the amount of printing on the dial, resulting in a cleaner and more refined look. By removing unnecessary details and leaving only the essential elements, the dial becomes more visually appealing and easier to read. This modification reflects Omega’s dedication to simplicity and elegance in design.

Wrist Fit

Recommendation for Wrist Size

The Seamaster 300 is designed to be worn comfortably on a range of wrist sizes. While personal preferences may vary, a general recommendation for optimal wrist size would be between 6.5 to 8.0 inches in circumference. This range ensures a good fit that neither feels too tight nor too loose on the wrist. However, it is always recommended to try on the watch before making a purchase to ensure the perfect fit and comfort.


The Seamaster 300 excels in providing a comfortable wearing experience. The ergonomic design of the case and bracelet ensures that the watch sits well on the wrist without causing any discomfort. The slightly curved lugs allow the watch to conform to the natural shape of the wrist, while the adjustable bracelet provides flexibility to fine-tune the fit. Whether you are wearing the Seamaster 300 for a short period or throughout the day, you can expect a comfortable and enjoyable experience.

Bracelet Design

The bracelet design of the Seamaster 300 contributes to its overall comfort and wearability. The links are carefully crafted to provide a smooth and flexible feel on the wrist. The combination of polished and brushed finishes adds to the visual appeal of the bracelet, while the secure clasp ensures that the watch stays securely in place. The bracelet of the Seamaster 300 is not only a functional component but also an aesthetic one, enhancing the overall design of the watch.



The clasp of the Seamaster 300 features a sleek and practical design. It is crafted from stainless steel, ensuring durability and longevity. The clasp is designed to seamlessly blend in with the overall aesthetic of the bracelet, creating a cohesive and elegant look. Its low-profile design prevents it from catching on clothing or other objects, while its smooth and rounded edges ensure comfort during wear.

Security Features

The clasp of the Seamaster 300 is equipped with security features to ensure that the watch remains securely on your wrist. The folding clasp provides a secure closure, preventing accidental opening. Additionally, the clasp features a push-button release mechanism, allowing for easy putting on and taking off of the watch. The combination of these security features gives you peace of mind, knowing that your Seamaster 300 will stay in place, even during active movements or water activities.

Water Resistance


The water resistance of the Seamaster 300 is rigorously tested to ensure its reliability and performance. Each watch undergoes a series of tests that simulate both real-life and extreme conditions. These tests include the verification of water resistance at different depths, exposure to sudden temperature changes, and resistance to pressure changes. Only after successfully passing these tests is each Seamaster 300 certified as water-resistant and ready to accompany you on your aquatic adventures.

Bezel Operation

The bezel of the Seamaster 300 undergoes testing for its smooth operation and resistance to saltwater, sand, and other elements that it may be exposed to during water activities. The unidirectional rotation ensures that the bezel can be easily adjusted without accidentally moving in the wrong direction. This ensures accurate timing during your dives or any activity that requires precise tracking of elapsed time.

Loom Performance

The luminosity of the Seamaster 300 is tested to ensure its optimal performance in low-light or dark conditions. Each watch is exposed to different levels of light before being tested in a dark environment. The luminous material on the hour markers and hands is examined for its brightness and longevity. The loom performance of the Seamaster 300 guarantees that the watch remains highly visible in any lighting situation, allowing for easy and accurate time reading.


The Seamaster 300 is a timepiece that beautifully blends style, functionality, and durability. Its elegant design, paired with its robust construction, makes it suitable for a range of occasions and activities. The watch incorporates various modifications and updates that improve its overall performance and aesthetics, providing a timeless and versatile piece to wear.

With its impressive water resistance of 300 meters, the Seamaster 300 is ready to accompany you on your underwater adventures. The Caliber 8912 movement ensures exceptional accuracy, while also offering convenient features such as a hacking seconds function and a power reserve of approximately 60 hours.

Aside from its technical features, the Seamaster 300 is designed to provide a comfortable and secure fit. The bracelet design, clasp mechanism, and wrist fit recommendations all contribute to its wearability and suitability for different wrist sizes.

In conclusion, the Seamaster 300 is not just a timepiece; it is an embodiment of Omega’s commitment to craftsmanship, innovation, and timeless design. Whether you are a professional diver, an avid adventurer, or simply someone who appreciates exceptional timepieces, the Seamaster 300 is a watch that you can rely on for its performance, durability, and style.

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