Head-to-Head Comparison

Updated September 5, 2026

Seiko Presage SSA425 Open Heart vs Rolex Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial)

Two timepieces compared — $250–$500 vs $25,000+

Quick Verdict

The Seiko Presage SSA425 Open Heart ($250–$500) offers Seiko In-House Automatic precision in the tier below the Rolex Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial) ($25,000+). The Presage SSA425 Open Heart measures 40.5mm and is rated 50m (5 ATM). The Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial) counters with Swiss Made craftsmanship and 100m (10 ATM) per Rolex for the Oyster case water resistance. Both are exceptional timepieces for their respective tiers.

SeikoPresage SSA425 Open Heart$250–$500 Check price RolexLady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial)$25,000+ Check price

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Seiko

Presage SSA425 Open Heart

$250–$500

Check Price Full Review

Rolex

Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial)

$25,000+

Check Price Full Review

Specifications Compared

Feature	Seiko Presage SSA425 Open Heart	Rolex Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial)
Price	$250–$500	$25,000+
Case Size	40.5mm	26mm
Movement	Automatic Caliber 4R38	Automatic, Rolex calibre 2135, quickset date
Caliber Type	Seiko In-House Automatic	Rolex 2135, chronometer certified
Power Reserve	41 Hours	About 42 hours
Water Resistance	50m (5 ATM)	100m (10 ATM) per Rolex for the Oyster case
Crystal	Hardlex Crystal	Sapphire Crystal
Case Material	Stainless Steel	18k yellow gold, factory diamond bezel and diamond-set lugs
Origin	Made in Japan	Swiss Made

Category-by-Category Analysis

🎨

Design & Aesthetics

Edge: Draw

Seiko's design language vs Rolex's approach

The Seiko Presage SSA425 Open Heart features a Stainless Steel case at 40.5mm with Hardlex Crystal protection. The Rolex Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial) offers 18k yellow gold, factory diamond bezel and diamond-set lugs construction at 26mm with Sapphire Crystal. Both represent their brand's distinct design philosophy and heritage.

⚙️

Movement & Performance

Edge: Rolex

Automatic Caliber 4R38 vs Automatic, Rolex calibre 2135, quickset date

The Presage SSA425 Open Heart runs the Automatic Caliber 4R38 (Seiko In-House Automatic, 41 Hours power reserve) at 21,600 vph (3 Hz) frequency. The Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial) uses the Automatic, Rolex calibre 2135, quickset date (Rolex 2135, chronometer certified, About 42 hours reserve) at standard. The Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial) offers a longer power reserve.

📏

Wearability & Fit

Edge: Rolex

40.5mm vs 26mm — different wrist presence

At 40.5mm, the Presage SSA425 Open Heart has a bolder wrist presence compared to the Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial) at 26mm. Water resistance differs: 50m (5 ATM) vs 100m (10 ATM) per Rolex for the Oyster case.

💰

Value & Cost of Ownership

Edge: Seiko

Seiko sits in the lower tier

The Seiko Presage SSA425 Open Heart sits at $250–$500 and the Rolex Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial) at $25,000+. On the specs that outlast any price: the Presage SSA425 Open Heart uses Hardlex Crystal with 41 Hours, against Sapphire Crystal and About 42 hours on the Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial). Service intervals are typically 5-7 years for both.

💧

Water Resistance

Edge: Rolex

50m (5 ATM) vs 100m (10 ATM) per Rolex for the Oyster case

The Presage SSA425 Open Heart is rated to 50m (5 ATM) while the Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial) handles 100m (10 ATM) per Rolex for the Oyster case. The Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial) offers superior water resistance.

Our Verdict

Seiko

Presage SSA425 Open Heart

Choose the Seiko Presage SSA425 Open Heart if you prioritize Seiko In-House Automatic engineering, Made in Japan craftsmanship, and 50m (5 ATM) water resistance. At $250–$500, it delivers Automatic Caliber 4R38 with 41 Hours power reserve.

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Rolex

Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial)

Choose the Rolex Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial) if you value Rolex 2135, chronometer certified technology, Swiss Made heritage, and 26mm proportions. At $25,000+, the Automatic, Rolex calibre 2135, quickset date with About 42 hours power reserve makes it a compelling choice.

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The Bottom Line

The Seiko Presage SSA425 Open Heart and Rolex Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial) represent two distinct approaches to the timepiece category — the Seiko bringing Made in Japan tradition while Rolex delivers Swiss Made engineering.

Frequently Asked Questions

For water, the Rolex Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial) is rated 100 m against 50 m, which is the difference between swimming and diving on one side and splashes on the other. On price, the Seiko Presage SSA425 Open Heart sits a band lower ($250–$500 against $25,000+), so it is the cheaper way into the category. Neither is better at everything; the spec table above shows movement, case size, water resistance and crystal side by side so you can weigh what matters to you. We do not test units, so this is the makers' data, not a bench result.

The Seiko Presage SSA425 Open Heart offers better upfront value, sitting a tier lower at $250–$500. However, the Rolex Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial) may justify its premium with superior finishing, heritage, or resale value.

Both are suitable for daily wear. The Presage SSA425 Open Heart at 40.5mm with 50m (5 ATM) water resistance handles everyday situations. The Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial) at 26mm with 100m (10 ATM) per Rolex for the Oyster case is similarly capable. The Presage SSA425 Open Heart uses Hardlex Crystal while the Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial) uses Sapphire Crystal.

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How This Page Was Made

Our comparisons are generated from a hand-maintained specification database and reviewed under our editorial standards. We use AI tools to assemble pages from that data. We don’t invent specs: every number traces back to the database, and when we correct an entry, the fix is applied site-wide. As an Amazon Associate, The Horologist earns from qualifying purchases.