Omega Seamaster Automatic Blue Dial Men’s Watch 210.32.42.20.03.001 review: 300m dive watch, chronometer accuracy

Overview

This listing is for a 42 mm stainless-steel automatic dive watch featuring a blue wave-pattern dial, a blue ceramic bezel with a white enamel diving scale, a blue rubber strap, and a self-winding Master Chronometer movement. It’s finished with a domed, scratch‑resistant sapphire crystal that’s anti‑reflective on both sides, an anti‑magnetic construction, a date complication, a helium escape valve, a unidirectional rotating bezel, and a sapphire exhibition case back (all per the product listing).

It’s aimed at watch enthusiasts who want a daily-wearable diver with modern materials and a premium movement, swimmers and water‑sport fans who value legibility and robustness, and anyone who prefers a contemporary blue-on-blue aesthetic over dressier or vintage‑leaning pieces. Quick verdict: a refined, capability‑focused automatic dive watch that blends real tool‑watch features with everyday comfort and visual pop.

What’s in the Box

• The watch described in this listing (stainless-steel case, blue rubber strap) — Included
• Presentation/watch box — Not specified
• Warranty card or booklet — Not specified
• Instruction manual — Not specified
• Extra strap, bracelet, or tools — Not specified
• Hang tag or serial documentation — Not specified

If the package contents matter for you (e.g., a particular box set or accessories), verify with the seller before purchase.

Design & Build

At 42 mm in diameter (per the listing), this watch is built to read large and clear without venturing into oversized territory for a modern dive watch. The stainless-steel case offers a reassuring, tool‑ready feel and pairs well with the blue rubber strap for comfort and water resistance. Rubber straps often wear lighter than metal bracelets and conform quickly to the wrist, which can make a 42 mm case feel more balanced during all‑day wear.

The blue dial with a wave pattern adds depth and texture. Dial textures aren’t just decorative; they play with light to maintain legibility at different angles. Combined with a blue ceramic bezel that carries a white enamel diving scale, the overall look is coherent and functional. Ceramic’s hardness helps the bezel ring resist scratches far better than anodized aluminum.

On top, you get a domed, scratch‑resistant sapphire crystal that the listing says is anti‑reflective on both sides. Dual‑sided AR is a real-world benefit, cutting glare both from the outside and from internal reflections. That means faster reads in bright sun or under harsh lighting. Around back, a sapphire exhibition case back displays the movement—another nod to enthusiasts who appreciate finishing and mechanics.

The movement is a self‑winding automatic Master Chronometer caliber (per the listing), adding recognized standards for precision and magnetic resistance. There’s also an anti‑magnetic design, a date display, a helium escape valve for professional diving environments, and a unidirectional rotating bezel for timing. Together, these details place the watch firmly in the “modern diver built for daily wear” category.

Key Features

Blue Dial with Wave Pattern

The wave motif gives the dial dimensionality and a maritime identity. In practical terms, a textured dial can break up reflections that sometimes obscure flat, glossy surfaces. The blue tone strikes a balance between sporty and versatile: it’s vivid enough to stand out with casual wear and restrained enough to pair with business‑casual attire. If you rotate between multiple watches, this becomes an easy pick on days when you want personality without loudness.

Blue Ceramic Bezel with White Enamel Diving Scale

Ceramic’s high scratch resistance helps keep the bezel looking fresh even after brushes with doorframes, sand, or pool edges. The white enamel scale stands out against the blue for quick elapsed‑time reads—useful for anything from timing a plunge to monitoring pasta or meeting breaks. Because it’s a unidirectional bezel (per the listing), accidental knocks shorten, rather than extend, a set time—an important safety behavior in diving contexts.

Stainless-Steel Case on Blue Rubber Strap (42 mm)

Stainless steel is the do‑everything case material for tool watches. It’s robust, easy to refinish, and comfortable for everyday use. The blue rubber strap is a practical match for water‑oriented activities: it won’t soak up sweat or pool water, it cleans easily, and it tends to feel lighter than a steel bracelet. At 42 mm (according to the listing), this wears like a contemporary diver; most wrists that handle 41–42 mm sports watches should find the proportions familiar. If you prefer under‑the‑cuff slimness, consider how your shirt cuffs accommodate a diver profile.

Self‑Winding Automatic Master Chronometer Movement

An automatic movement winds with your wrist motion. That means no battery and no daily hand‑winding if you’re wearing it regularly. The listing describes the movement as a Master Chronometer, signaling a high bar for accuracy and anti‑magnetic performance. In daily life, this translates to dependable timekeeping and peace of mind around laptops, phone cases with magnets, and other magnetic fields you’re likely to encounter.

Domed Scratch‑Resistant Sapphire with Anti‑Reflective Treatment on Both Sides

Sapphire ranks very high on the hardness scale, so it’s much tougher to scratch than mineral glass or acrylic crystals. The domed profile adds a touch of vintage charm and helps with off‑axis legibility. Anti‑reflective coatings on both sides of the crystal reduce glare, making the dial easier to read in bright sun, in a car, or under office LEDs. The fewer reflections you fight, the quicker you can read the time at a glance.

Anti‑Magnetic Construction

The listing states that the watch is anti‑magnetic. Modern life is filled with sources of magnetism—phone cases, handbags with magnetic closures, headphones, laptop speakers, tablet covers, even induction cooktops. Anti‑magnetic engineering helps preserve accuracy when you’re around those everyday fields. That reduces the need for demagnetization and improves long‑term reliability.

Date Complication

A date window adds daily convenience. If you live in a calendar app, it may seem redundant, but a quick look at the wrist can be faster than unlocking a phone. If you travel or switch watches frequently, the date can help you re‑anchor your day in one glance.

Helium Escape Valve

The helium escape valve exists for saturation diving, where helium molecules can enter a watch case under high pressure and then expand during decompression. For almost everyone else, it’s a specialized feature you may never use, but it remains a sign of a serious tool‑watch spec. Practically, it doesn’t get in the way of daily wear; consider it a capability marker for those who demand professional‑level features.

Unidirectional Rotating Bezel

Beyond diving, a unidirectional timing bezel is a handy everyday tool. Set the zero marker to the minute hand, and you’ve got an easy tracker for parking meters, coffee brews, workout intervals, phone calls, or meetings. The unidirectional action means your timer can only get shorter if bumped, not longer—safer for critical timing.

Sapphire Crystal Exhibition Case Back

A transparent back lets you see the movement at work: the rotor swinging as you move, the balance oscillating, and the finishing details you’d otherwise never notice. For many enthusiasts, this “living machine” view is a big part of the joy of mechanical watches, turning a practical object into a small piece of kinetic art.

Performance & Use

Wearing experience

• On the wrist, a 42 mm diver typically wears confident but not overwhelming. The rubber strap trims weight and adds flexibility, so the watch tends to sit flat and secure. If you’re used to metal bracelets, the strap will feel more forgiving during warm weather when wrists can swell slightly.
• The dual‑AR sapphire crystal (per the listing) improves dial clarity. Expect easy reads outdoors, on the water, and under bright indoor lighting.

Accuracy and reliability

• The listing’s Master Chronometer movement indicates a high standard for precision and resistance to magnetism. That’s good news for users who rely on their watch to stay close to the correct time without frequent micro‑adjustments.
• Anti‑magnetic construction means fewer accuracy hiccups from everyday magnets. If you’ve ever had a mechanical watch suddenly run fast or slow after a brush with a handbag clasp or tablet cover, you’ll appreciate this resilience.

Timing and legibility

• The white enamel diving scale on the blue ceramic bezel offers strong contrast for timing. Pair it with prominent minute markings on the dial for quick elapsed-time checks.
• The unidirectional bezel’s action should be deliberate and secure (exact bezel feel is not described in the listing), which is important for precise setting during activities.

Date and daily practicality

• The date window adds easy utility at work and while traveling. If you keep multiple watches in rotation, a date quick‑set (not specified) is useful—when in doubt, always avoid changing the date when the hands are near midnight to reduce the risk of stressing the mechanism.

Water and activity readiness

• While the listing includes features associated with serious divers—unidirectional bezel, helium escape valve—no explicit water-resistance rating is provided here. For swimming, snorkeling, or diving, verify the rated depth with the seller or manufacturer before submerging the watch.
• The rubber strap is well‑suited to water, sweat, and gym use. Rinse it with fresh water after pool or saltwater exposure to keep it looking new.

Care and maintenance

• Cleaning: Wipe the case and bezel with a soft, damp cloth; use mild soap and water on the rubber strap. A soft brush helps lift debris from bezel knurling and case crevices.
• Crystal care: Sapphire is highly scratch‑resistant, but the anti‑reflective coatings can mark if scraped against abrasive surfaces. Avoid gritty sand or rough concrete when possible.
• Magnetism: This watch is anti‑magnetic (per the listing), so it’s less likely to be affected by magnets, but keeping strong magnets at a distance is still a best practice for any mechanical watch.
• Service: Mechanical watches benefit from periodic servicing to maintain lubrication and water resistance. The interval isn’t specified in the listing—consult the brand’s guidance or ask the seller for documentation.

Travel and lifestyle

• For frequent travelers or those who work in environments with strong lighting, the combination of AR-coated sapphire and high-contrast bezel markings supports legible, at-a-glance reading.
• The blue color scheme adds personality to neutral wardrobes and looks particularly good with denim, navy outerwear, white tees, sailcloth, and summer gear. It can also complement business-casual attire (think oxford shirts or knit polos), lending a subtle sporty edge.

Why this watch over another diver?

• Feature density: You get modern materials and specs—ceramic bezel, sapphire crystals front and back, dual‑sided AR, anti‑magnetic design, Master Chronometer movement—without straying into overly bulky dimensions.
• Everyday comfort: The rubber strap keeps the package light and secure, a big plus if you’re on the move or in warm climates.
• Visual identity: The wave‑pattern blue dial is distinctive without being loud. If you want a sport watch you can wear in most settings, the aesthetic walks that line well.

Automatic versus quartz considerations

• This is a mechanical automatic, which enthusiasts value for craftsmanship and tactile connection. It’s powered by your motion, with a rotor that winds the mainspring as you wear it.
• Quartz watches are generally more set‑and‑forget, but the charm of an automatic lies in the engineering, the sweep of the seconds hand, and the exhibition case back view.
• If you’re new to mechanical watches, remember that they can drift slightly over time. The Master Chronometer designation (per the listing) is meant to keep that drift very tight and consistent.

Using the bezel in real life

• Meetings: Set the zero marker to the minute hand at the start to keep yourself on schedule.
• Exercise: Track rest intervals or total set times without fiddling with a phone.
• Cooking: Time pasta or coffee extraction—with the safety of unidirectional movement if bumped.
• Commutes: Track parking meters or train headways at a glance.

When you’ll appreciate anti‑magnetic engineering

• At a standing desk with a laptop and external speakers
• Resting your wrist near a tablet cover’s magnetic closure
• Wearing Bluetooth headphones with magnetized drivers
• Handling bags with snap‑magnet clasps

When the helium valve matters (and when it doesn’t)

• Matters: Saturation diving in a pressurized environment where helium gas can penetrate the watch and needs a safe exit during decompression.
• Doesn’t matter for most: Recreational diving, swimming, showers, or daily wear. You can safely ignore it unless you’re in that professional scenario.

Pros and Cons

Who Should Buy This

• You want a modern, blue‑themed automatic dive watch that blends robust specs with daily wear comfort.
• You value scratch resistance and legibility: ceramic bezel, dual‑AR sapphire, strong color contrast.
• You prefer a premium movement standard and reassurance against magnetism in everyday environments.
• You like an enthusiast‑friendly design touch such as an exhibition case back without giving up tool‑watch credibility.
• You need a watch that works for water‑adjacent life—swimming, boating, beach days—pending confirmation of water resistance from the seller.

Who Shouldn’t Buy This

• You require a specific, stated water‑resistance rating in the listing before you’ll consider a diver.
• You prefer smaller watches (e.g., 38–40 mm) and find 42 mm cases too dominant.
• You want a metal bracelet included out of the box rather than a rubber strap.
• You don’t care about mechanical movements and would rather have quartz convenience and absolute accuracy.
• You want a minimal, dress‑watch aesthetic without rotating bezels, date windows, or specialized features.

Specifications

Only details visible in the provided listing are included below. Everything else is marked “Not listed.”

Final Thoughts

If you’re after an automatic dive watch that looks sharp, reads clearly in bright light, and packs modern‑material durability, this blue‑on‑blue 42 mm model checks the right boxes. It’s a strong everyday companion with the kind of movement and build features enthusiasts appreciate—and enough capability to handle active weekends. Confirm water resistance and package details with the seller, pick the size and strap that suit your wrist, and you’ll have a versatile sport watch ready for almost anything.