Omega Seamaster Sedna Blue Dial Steel and 18kt Yellow Gold Watch 210.20.42.20.03.001 review: 300m water resistance, luxury dive watch

Omega Seamaster Diver 300M (Model 210.20.42.20.03.001) — Expert Review

Looking for a luxury dive watch that can go from the boardroom to the beach without missing a beat? The Omega Seamaster Diver 300M (model 210.20.42.20.03.001) is the two-tone, blue‑dial variant of Omega’s modern classic—combining steel and gold, sporty capability, and everyday versatility. It’s a celebrated reference in the Seamaster line, loved for its blend of heritage styling, contemporary materials, and Master Chronometer-certified performance.

This review focuses on helping you decide quickly and confidently. We’ll unpack who this watch is for, what it’s like to wear, how it performs day to day, and what you should know before you buy. We reference manufacturer information where relevant and clearly note where the original listing doesn’t specify details.

Quick verdict: If you want a handsome, two-tone dive watch that mixes proven performance with luxury finishing, the Omega Seamaster Diver 300M 210.20.42.20.03.001 is a top-tier choice—just be sure you’re comfortable with the added weight and price premium that come with steel and gold.

What’s in the Box

The provided listing includes only the model number (210.20.42.20.03.001). Typical inclusions for a new Omega watch may vary by seller and region. Because the Amazon listing does not specify contents, treat the items below as “not specified” unless your seller confirms otherwise.

• Watch: Omega Seamaster Diver 300M, Model 210.20.42.20.03.001
• Bracelet/Strap: Not specified
• Presentation box: Not specified
• Operating instructions: Not specified
• Warranty card(s) / Pictograms / Master Chronometer card: Not specified
• Extra links or tools: Not specified

Tip: If box and papers matter to you (for warranty, resale value, or completeness), ask the seller to confirm exactly what’s included before purchase.

Design & Build

The 210.20.42.20.03.001 is the two-tone (steel and gold) version of the Seamaster Diver 300M with a blue dial and bezel. The “42” in the reference denotes a 42 mm case size—a contemporary but wearable dimension for a modern dive watch. The Diver 300M case is sculpted with twisted “lyre” lugs and a mix of brushed and polished surfaces that catch light beautifully, especially with the addition of gold accents on the bezel, crown, bracelet center links, and hands/indices.

• Case and bezel: The Diver 300M is known for its ceramic bezel insert and unidirectional timing ring. On two-tone models, the bezel often features gold accents in the numerals and markers for a warm contrast against the blue ceramic.
• Dial: The current-generation Diver 300M uses a polished ceramic dial with laser-engraved wave pattern (a signature of the line). The rich blue color suits the steel-and-gold palette and keeps legibility high, aided by prominent applied indices and skeletonized hands.
• Bracelet: Two-tone bracelets add sophistication but can increase overall weight. The bracelet on this model is a three-link design with alternating brushed and polished surfaces, tapering toward the clasp for comfort.
• Ergonomics: At 42 mm, this watch has wrist presence, yet the curved lugs help it sit well on a range of wrists. The helium escape valve at 10 o’clock is a hallmark of the model—practical for saturation diving and a distinctive design element in daily wear.

Note: Specific measurements (thickness, lug-to-lug, weight) are not listed in the provided Amazon input. For exact dimensions and mass, consult the manufacturer or a trusted retailer.

Key Features

Master Chronometer certification (accuracy, anti‑magnetism, reliability)

Omega’s recent Diver 300M models are certified as Master Chronometers by METAS, the Swiss Federal Institute of Metrology. According to Omega, this standard tests the watch for accuracy after casing, resistance to magnetic fields up to 15,000 gauss, water resistance, and power reserve. In practical terms, you can expect robust performance in real-world conditions—from working near electronics to traveling across climates—without babying the watch.

Real-life benefit:

• Stable timekeeping across daily wear scenarios.
• Peace of mind around laptops, speakers, and magnetic clasps that can disrupt lesser movements.
• A movement tuned for reliability and verified beyond COSC chronometer testing.

Ceramic bezel for durability and scratch resistance

The Diver 300M uses a ceramic bezel insert, a material prized for its hardness and colorfastness. On this two-tone reference, you get the best of both worlds: the crisp, glossy blue of ceramic and warm gold accents for the minute scale.

Real-life benefit:

• The bezel remains sharp and vibrant after years of use.
• Less worry about swapping out a scuffed aluminum insert—ceramic stands up to desk life and pool days alike.
• Clear, legible dive timing if you actually use it for swimming, snorkeling, or timing pasta in the kitchen.

Blue ceramic dial with laser‑engraved waves

A hallmark of the current-generation Seamaster Diver 300M is its ZrO2 (ceramic) dial with laser-engraved waves. The blue tone plays beautifully with steel and gold, and the wave motif gives the watch personality without shouting.

Real-life benefit:

• Excellent legibility thanks to high-contrast hands and markers.
• A dial that resists fading and minor scratches better than traditional lacquer or painted finishes.
• Looks dressy under a cuff yet unabashedly sporty in shorts and a tee.

300 m water resistance (manufacturer-rated)

As the name suggests, the Diver 300M is rated to 300 meters (per Omega). That’s more than enough for recreational diving, let alone swimming, showering, or getting caught in a storm.

Real-life benefit:

• No need to think twice around water. Swim, snorkel, or wash hands with complete confidence.
• If you travel often, the screw‑down crown and robust gaskets make it a worry‑free companion.
• A dependable, do‑it‑all daily watch you don’t have to baby.

Helium escape valve at 10 o’clock

The conical helium escape valve is both functional and iconic. It allows trapped helium to exit during decompression after saturation diving. While most owners won’t use it, it’s part of the Diver 300M’s identity and a conversation starter.

Real-life benefit:

• Tool-watch credibility rooted in real diving tech.
• A distinctive visual cue that separates the Seamaster from other dive watches.

Two-tone bracelet and clasp

The bracelet on this reference combines stainless steel outer links with gold center links, providing a luxurious, dress-capable aesthetic. Omega bracelets are known for solid construction and secure clasps, often with a diver’s extension or comfort adjustment on the Diver 300M lineup.

Real-life benefit:

• A single watch that can be your weekday office piece and weekend companion.
• The steel-and-gold combination pairs with both silver and gold accessories.
• Potential on-the-fly adjustment (feature varies by specific configuration)—handy for warmer days when your wrist swells.

Note: The exact clasp features of this specific listing are not stated in the provided input. Check with the seller for confirmation on micro‑adjust or diver’s extension.

Nighttime legibility with Super‑LumiNova

The Diver 300M line uses Super‑LumiNova on the hands and indices, making it easy to read in low light.

Real-life benefit:

• Quick time checks at a dark restaurant, on a red-eye flight, or pre-dawn workout.
• Lume pip on the bezel allows timing in the dark, useful in more than just diving.

Performance & Use

The appeal of the Omega Seamaster Diver 300M 210.20.42.20.03.001 is how effortlessly it can be your single everyday watch—if you like the panache of two-tone. It’s sporty, water‑ready, travel‑friendly, and refined enough for business casual or a blazer.

Timekeeping and reliability

• As a Master Chronometer, the movement is lab-tested to stringent standards (per Omega/METAS). In everyday use, that typically translates to steady, predictable timekeeping.
• Anti-magnetism helps if you work around laptops, tablets, bags with magnetic closures, or small speakers—everyday exposures that can affect traditional mechanical watches.

Comfort and wearability

• At 42 mm, this is a modern-sized diver. If you have a smaller wrist, consider trying it on first; the lug curvature helps, but two-tone adds weight.
• The bracelet’s alternating finishes look premium; the clasp is secure. If your version includes a comfort extension, use it for temperature-induced wrist changes.

Setting the time and date (general tips)

• Unscrew the crown to the first position to wind; second position for date; third for time (behavior varies by movement; consult your manual).
• Avoid changing the date between roughly 8 pm–2 am to protect the date mechanism.
• Always screw the crown back in before water exposure.

Water use and care

• Rinse the watch in fresh water after ocean swimming to remove salt deposits.
• Periodically check that the crown is secure before swimming.
• If you dive or swim frequently, consider periodic pressure testing through a service center to ensure gaskets are sound.

Maintenance and servicing

• Mechanical watches benefit from regular servicing; intervals vary based on use and conditions. Omega recommends service roughly every 5–10 years; consult official guidance and your warranty terms.
• Two-tone bracelets and polished gold surfaces can show scratches more readily; consider occasional light polishing by a professional if desired, and avoid abrasive household cloths.

Sizing and adjustments

• Have the bracelet sized by a professional to avoid marking the screws or links.
• If your clasp has a diver’s extension, fold it out to fit over a wetsuit or to get a little extra room on humid days.

Resale and collectability

• Seamaster Diver 300M references enjoy broad recognition. Complete box and papers typically help with resale. If this matters to you, confirm inclusion with the seller before purchase.

Where to buy

OMEGA Seamaster Diver 300M - ref # 210.20.42.20.03.001 - 42mm

$9,600.00

View Deal

Omega Seamaster Sedna Blue Dial Steel and 18kt Yellow Gold...

$11,222.50

View Deal

New Omega Seamaster Diver 300M Automatic Self Wind Watch 210.20.42.20.03.001

$12,000.00

View Deal

Pros vs Cons

Who Should Buy (and Who Shouldn’t)

Buy it if:

• You want a luxury, two-tone dive watch that handles everyday life—work, travel, weekends—without fear of water.
• You appreciate Omega’s blend of heritage and modern tech (Master Chronometer, ceramic components).
• You prefer a blue dial with strong legibility and a design that stands out from the crowd in a tasteful way.
• You’re comfortable with the added weight and higher cost of steel-and-gold construction.

Consider another option if:

• You want a slimmer, ultra-discreet watch to slide under tight dress cuffs all day.
• You dislike two-tone styling or prefer a monochrome look.
• Your wrist is very small and you find 42 mm divers too dominant—try before you buy.
• You seek a budget-friendly daily watch; there are excellent steel-only models at lower price points.

Specs

Only verifiable specs from the provided listing can be included here. Since the input contains the model number but no further specifications, most fields are marked “Not listed.”

Note: In the review above, certain characteristics of the Omega Seamaster Diver 300M line (e.g., 300 m water resistance, Master Chronometer certification, ceramic bezel/dial) are described based on manufacturer information for this model family. Always verify final specifications with your seller before purchase.

Design & Build: Deeper Dive

The Seamaster Diver 300M design language has matured over decades. On this model, the interplay of steel and gold elevates it beyond a pure tool watch, while retaining all the hallmarks that made the Diver 300M a favorite:

• Twisted lugs and sculpted case flanks give it dynamism on the wrist.
• The blue ceramic bezel keeps the palette cohesive with the dial, and gold accents provide warmth.
• Skeletonized hands are a signature look—easy to pick out at a glance, especially with luminous fill.
• The date window at 6 o’clock (on current-generation models) preserves symmetry.

Ergonomic considerations:

• The 42 mm case feels modern but not oversized on most average-to-large wrists.
• The caseback on current models is typically sapphire, offering a view of the movement (check your specific piece).
• The helium valve is more streamlined in the latest generation than older iterations, helping it blend into the silhouette.

Finishing and feel:

• Two-tone watches amplify the feeling of luxury because gold surfaces reflect light differently from steel. Expect a “richer” look and more visual contrast at almost every angle.
• Brushed surfaces resist hairline scratches better; polished gold will show marks, which is a tradeoff for the bling factor.

Key Features: More Context

Daily-wear versatility

A blue two-tone dive watch might sound bold, but in practice it’s remarkably flexible:

• Business casual: Anchors navy, grey, and earth tones with ease.
• Casual: Works with denim, polos, and knitwear.
• Travel: Robust, legible, and easy to dress up or down.

Co‑Axial escapement benefits

Omega’s Co‑Axial escapement is designed to reduce friction versus traditional Swiss lever escapements, which can help extend service intervals and maintain performance over time. In everyday use, you won’t “feel” the difference, but you may appreciate the stability in timekeeping and the brand’s engineering pedigree.

Legibility and lume in real life

The Diver 300M typically uses Super‑LumiNova with blue/green emission for high contrast. At night, the bezel pip and hands make timing a snap—whether checking a steak on the grill or catching the last train. During the day, the polished indices and hands play with light, but the matte lume fill keeps them easy to read against the blue dial.

Bracelet practicality

Many Diver 300M bracelets include either a fold-out diver’s extension or a push-button comfort adjustment in the clasp. If you wear your watch slightly loose or live in a climate with big temperature swings, this feature is a game-changer for all-day comfort.

Note: The listing provided does not confirm the clasp type on model 210.20.42.20.03.001; verify with the seller.

Performance & Ownership Tips

• Strap changes: If you want to dress it down, consider a fitted rubber strap (blue looks great with the dial). For formal occasions, a high-quality leather strap can soften the sporty vibe—though leather shouldn’t be exposed to water.
• Magnetism: Even anti-magnetic movements benefit from mindful habits. Avoid placing the watch directly on strong magnets (e.g., tablet covers) for prolonged periods.
• Storage: If rotating multiple watches, consider a soft-lined tray or dedicated watch box to minimize bracelet scratches—especially on polished gold surfaces.
• Cleaning: Use lukewarm water and mild soap with a soft brush to clean the bracelet and case. Dry with a microfiber cloth.
• Pressure testing: Before a vacation that involves diving or frequent swimming, it’s smart to have water resistance tested, especially if the watch is several years old.

Buyer’s Checklist

Because the listing is sparse, here’s a quick checklist to finalize before buying:

• Confirm authenticity: Ask for serial numbers, photos of the caseback, clasp, and cards (if applicable).
• Verify inclusions: Box, instructions, warranty/pictograms, Master Chronometer card—if these matter to you.
• Bracelet sizing: Ask for the current link count and whether extra links are included.
• Condition (if not new): Request macro photos of the bezel edge, case flanks, gold center links, and clasp.
• Warranty status: Confirm whether the manufacturer warranty applies and its duration.

FAQs

Is the Omega Seamaster Diver 300M 210.20.42.20.03.001 suitable as a one-watch collection?

• Yes—if you like two-tone styling. It’s water-ready, robust, accurate, and refined enough for most settings.

Will the gold scratch?

• Gold is softer than steel and shows hairlines more readily, especially on polished areas. Light wear is normal; a professional can refinish during service.

Can I swim or dive with it?

• The Diver 300M line is manufacturer-rated to 300 m. Provided the crown is screwed down and the watch is properly maintained, it’s built for aquatic use. As always, verify water resistance if the watch is older or frequently used in water.

What is a Master Chronometer?

• It’s a certification (per Omega/METAS) that tests a cased watch for accuracy, magnetic resistance, water resistance, and power reserve. It’s among the most rigorous standards in watchmaking.

Is the bezel insert aluminum or ceramic?

• The Diver 300M uses ceramic for the bezel insert on current models, prized for scratch resistance and color stability.

Final Thoughts

The Omega Seamaster Diver 300M 210.20.42.20.03.001 hits a sweet spot for buyers who want their watch to do everything—keep great time, handle water with ease, and look unmistakably premium. The two-tone execution and blue ceramic elements give it a distinct identity, while the underlying platform remains a capable, modern dive watch with real engineering substance.

If that sounds like your ideal daily companion, this reference deserves a spot on your shortlist. Verify the exact inclusions and clasp features with the seller, and if possible, try it on to confirm the 42 mm presence works for you. Then enjoy a watch that’s as comfortable timing laps in the pool as it is anchoring a dinner outfit.