Omega Seamaster Diver 300M

Overview

The Omega Seamaster Diver 300M Ref. 210.30.42.20.01.010 is a contemporary luxury dive watch with the engineering, legibility and enduring design language expected of one of Omega’s most established professional collections. It combines a 42mm stainless steel case with a black ceramic bezel and matching wave-patterned ceramic dial, creating a purposeful monochrome appearance that remains refined enough for everyday wear.

Designed for serious water resistance while remaining comfortable away from the shoreline, this Seamaster Diver 300M offers a compelling balance of technical capability and visual sophistication. Its unidirectional bezel provides a practical elapsed-time scale, while luminous detailing supports clear reading in low-light conditions. The automatic Omega Master Chronometer Calibre 8800 adds modern mechanical performance, anti-magnetic protection and a 55-hour power reserve.

At a price of £6,740, this reference sits within Omega’s current generation of technically advanced dive watches. It is an especially appealing choice for buyers seeking a luxury sports watch that can function as a daily timepiece, travel companion and robust recreational diving instrument without losing the character of a carefully finished mechanical watch.

Brand and reference history

Omega’s Seamaster story began in 1948, but the collection’s professional diving identity developed through the following decades as the brand refined water resistance, case protection and underwater legibility. The Diver 300M name became particularly influential from the 1990s, when Omega introduced a distinctive modern dive-watch format that combined a helium escape valve, wave-patterned dial and strong professional credentials with a more wearable luxury-sports aesthetic.

Reference 210.30.42.20.01.010 belongs to the contemporary evolution of that established design. It retains the recognisable Seamaster Diver 300M architecture while updating important elements in ceramic, movement technology and finishing. The result is not a nostalgic reissue but a modern interpretation: familiar enough to be immediately identifiable as a Seamaster, yet technically developed for present-day expectations.

For collectors comparing the wider range of Omega watches, this reference demonstrates the brand’s ability to combine instrument-watch functionality with premium materials and expressive detailing. It occupies a different role from Omega’s chronographs and dressier collections, offering a direct connection to the brand’s maritime and professional tool-watch heritage.

Dial, hands and design detail

The black ceramic dial is the visual centre of this Seamaster Diver 300M. Its wave pattern is one of the collection’s defining signatures, giving the otherwise restrained monochrome surface depth and movement as the light changes across the wrist. Laser-engraved detailing creates a precise, contemporary finish, while the dark ceramic construction offers excellent resistance to everyday wear compared with more delicate dial materials.

Applied hour markers and hands are designed around immediate readability. Luminescent treatment allows the time to remain legible in dark conditions, an essential characteristic for a diving watch and a practical benefit for night-time use generally. The contrast between the luminous elements and the black dial is clean and purposeful, avoiding decorative complications that could compromise at-a-glance reading.

The black ceramic bezel insert reinforces the dial’s visual continuity. Its diving scale is arranged for timing elapsed periods, and the unidirectional action is an important safety feature: should the bezel be moved accidentally during a dive, it can only indicate less remaining time rather than creating a false impression of greater air supply. The overall design is highly recognisable without appearing overly busy.

Case, bracelet and wearability

The 42mm stainless steel case gives this Seamaster a confident presence while preserving the practical proportions expected of a modern sports watch. Stainless steel provides durability and a versatile finish, with polished and brushed surfaces contributing contrast around the case profile. The construction feels substantial without relying on excessive visual bulk, and the familiar helium escape valve at the case side reinforces the model’s professional diving lineage.

A polished black ceramic bezel insert brings both resilience and visual sharpness. Ceramic is valued for its resistance to scratching, fading and everyday surface wear, helping the bezel retain its crisp appearance over time. The bezel’s unidirectional operation is tactile and functional, offering the controlled, purposeful interaction associated with a serious dive watch.

The stainless steel bracelet completes the watch’s versatile character. It is suited to active use, office wear and travel, while the metal construction offers a secure, integrated feel on the wrist. The combination of steel, black ceramic and restrained dial detailing means the watch can be paired easily with casual clothing or a more formal wardrobe, making it a practical alternative to owning separate sports and everyday watches.

Movement and technical specification

Powering the watch is Omega’s automatic Master Chronometer Calibre 8800. This movement represents a significant step beyond conventional mechanical timekeeping, having been developed to deliver dependable accuracy and resistance to the environmental influences that can affect a modern wristwatch. It is resistant to magnetic fields of up to 15,000 gauss, a specification that offers meaningful protection in everyday environments containing electronic devices, speakers and magnetic closures.

The Calibre 8800 provides a 55-hour power reserve, allowing the watch to continue running for more than two days when fully wound and then left unworn. Its automatic winding system converts wrist movement into stored energy, while the movement’s construction is engineered for stable, reliable performance. As a Master Chronometer calibre, it reflects Omega’s emphasis on tested accuracy, magnetic resistance and functional durability.

A transparent sapphire caseback allows the movement to be viewed from the reverse side. This is an important point of difference from a purely utilitarian tool watch: the wearer can appreciate the decoration, architecture and mechanical operation of the calibre, while the sapphire material provides strong resistance to scratching. The movement complements the watch’s external design by combining technical credibility with visible horological refinement.

The principal specification is as follows:

• Reference: 210.30.42.20.01.010
• Case material: Stainless steel
• Case diameter: 42mm
• Bezel: Unidirectional rotating bezel with polished black ceramic insert
• Dial: Black ceramic with laser-engraved wave pattern
• Movement: Omega Master Chronometer Calibre 8800
• Winding: Automatic
• Power reserve: Approximately 55 hours
• Magnetic resistance: Up to 15,000 gauss
• Caseback: Transparent sapphire crystal

Sizing and how it wears

At 42mm, this Seamaster Diver 300M occupies a contemporary but broadly wearable size. The diameter provides strong dial presence and preserves the visual authority expected from a professional dive watch, while the stainless steel construction gives the piece a reassuring sense of solidity. Buyers accustomed to smaller vintage watches may notice the modern proportions, but the design remains balanced rather than oversized.

The black dial and bezel can make the watch appear slightly more compact than a brightly coloured or fully polished sports watch, because the dark surfaces create a visually cohesive outline. This helps the 42mm case transition comfortably from active settings to daily wear. On the bracelet, it has the confident stance of a luxury sports watch; it is noticeable on the wrist but not dependent on excessive thickness or ornament.

Wrist shape and personal preference remain important. The watch will suit wearers who enjoy a clear, substantial presence and the tactile feel of a steel bracelet. Those who prefer discreet vintage proportions may find it more assertive, while enthusiasts seeking one versatile modern watch are likely to appreciate its combination of visibility, comfort and robust construction.

Collectability and market value

The Seamaster Diver 300M has a strong place in modern watch collecting because its identity is unusually consistent. The wave dial, helium escape valve, rotating bezel and professional diving specification make it instantly recognisable, while successive technical updates have kept the model relevant. This reference benefits from that established recognition and from Omega’s continued investment in ceramic components and Master Chronometer movements.

Its black-on-black configuration is particularly versatile. Unlike limited colourways that may appeal to a narrower audience, the monochrome palette has lasting practicality and broad wardrobe compatibility. The ceramic dial and bezel also give the watch a contemporary finish that is likely to remain attractive as tastes change. For buyers who want a collectable luxury sports watch that can genuinely be worn frequently, this is a persuasive combination.

Market value is influenced by condition, completeness, service history and the quality of the bracelet, as well as by broader demand for modern Omega sports models. At £6,740, this watch should be assessed as a complete ownership proposition rather than by specification alone. Its technical movement, durable materials and enduring design all contribute to its appeal in the pre-owned market.

Those building a broader collection of dive watches may value this Seamaster as a modern benchmark, while collectors focused on Omega can view it alongside the brand’s chronograph heritage, including the more timekeeping-oriented Omega Speedmaster.

Authenticity, condition and servicing

Authenticity is central to any pre-owned luxury watch purchase. A proper assessment considers the reference, case architecture, dial printing, hands, bezel, bracelet, movement and caseback together rather than relying on a single visual detail. The specification of this watch is clear: Ref. 210.30.42.20.01.010, stainless steel construction, black ceramic components and Omega Master Chronometer Calibre 8800.

Condition should be judged in the context of a modern sports watch intended to be worn. Light evidence of use may be consistent with honest ownership, while the sharpness of the case, clarity of the ceramic surfaces and overall bracelet condition are especially relevant when evaluating presentation. We do not add unprovided claims about provenance, serial numbers, warranty status or service dates; any such details should be confirmed directly as part of the purchase process.

Mechanical watches benefit from professional servicing when performance, lubrication or water-resistance testing indicates that attention is required. Diving watches deserve particular care because seals, gaskets, crown operation and the caseback all contribute to protection from moisture. Even when a watch is rated for substantial water resistance, it should not be exposed to water after impact or prolonged use without appropriate checks.

A future service should be entrusted to suitably qualified watchmakers familiar with Omega movements. Correct parts, specialist equipment and proper testing are important, particularly for a Master Chronometer calibre and a watch designed around water resistance. Keeping service documentation and maintaining the bracelet and clasp carefully will also support the watch’s long-term ownership value.

Buying this watch from us

This Omega Seamaster Diver 300M Ref. 210.30.42.20.01.010 is offered at £6,740. It is a strong option for someone seeking a high-specification modern dive watch with an immediately recognisable design, an advanced anti-magnetic movement and the practicality of stainless steel construction. The black ceramic dial and bezel give it a particularly clean, versatile character.

We aim to present pre-owned watches with clear, useful information so buyers can make an informed decision. Our product description identifies the known reference and technical features without overstating details that have not been supplied. If you require confirmation of condition, included accessories, service information or other purchase particulars, these should be requested before completing the transaction.

For those new to luxury mechanical watches, the Seamaster Diver 300M is an approachable place to begin: its operation is intuitive, its design has genuine history and its performance credentials are easy to understand. For experienced collectors, it offers the reassurance of a mature model family with a technically sophisticated calibre and a finish that remains distinctive without being difficult to wear.

Whether selected as a daily watch, a travel companion or the modern sports cornerstone of a collection, this Seamaster offers a considered blend of function and finish. Its 42mm case, wave-patterned ceramic dial, black ceramic bezel and Master Chronometer movement create a package that is both purposeful and premium.

Frequently asked questions

What is the reference number of this Omega Seamaster Diver 300M?

This watch is Omega Seamaster Diver 300M Ref. 210.30.42.20.01.010.

What size is the case?

The stainless steel case measures 42mm in diameter, giving the watch a substantial modern sports-watch presence.

What movement does the watch use?

It is powered by the automatic Omega Master Chronometer Calibre 8800, which offers a 55-hour power reserve and resistance to magnetic fields up to 15,000 gauss.

What are the dial and bezel made from?

The watch has a black ceramic dial with a laser-engraved wave pattern and a polished black ceramic insert in its unidirectional rotating bezel.

Can the movement be seen?

Yes. The watch has a transparent sapphire caseback, allowing the finishing and operation of the Calibre 8800 to be viewed.

How much does this watch cost?

The listed price is £6,740. Please confirm current availability and any additional purchase details with us before ordering.