Head-to-Head Comparison

Updated September 5, 2026

Seiko Presage SSA425 Open Heart vs Rolex Day-Date 18238 (18k yellow gold, blue diamond 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 Day-Date 18238 (18k yellow gold, blue diamond dial) ($25,000+). The Presage SSA425 Open Heart measures 40.5mm and is rated 50m (5 ATM). The Day-Date 18238 (18k yellow gold, blue diamond dial) counters with Swiss Made craftsmanship and 100m (10 ATM) water resistance. Both are exceptional timepieces for their respective tiers.

SeikoPresage SSA425 Open Heart$250–$500 Check price RolexDay-Date 18238 (18k yellow gold, blue diamond dial)$25,000+ Check price

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Seiko

Presage SSA425 Open Heart

$250–$500

Check Price Full Review

Rolex

Day-Date 18238 (18k yellow gold, blue diamond dial)

$25,000+

Check Price Full Review

Specifications Compared

Feature	Seiko Presage SSA425 Open Heart	Rolex Day-Date 18238 (18k yellow gold, blue diamond dial)
Price	$250–$500	$25,000+
Case Size	40.5mm	36mm
Movement	Automatic Caliber 4R38	Automatic, Rolex Calibre 3155
Caliber Type	Seiko In-House Automatic	Rolex 3155, in-house automatic, chronometer
Power Reserve	41 Hours	About 48 hours
Water Resistance	50m (5 ATM)	100m (10 ATM)
Crystal	Hardlex Crystal	Sapphire Crystal, Cyclops
Case Material	Stainless Steel	18k yellow gold
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 Day-Date 18238 (18k yellow gold, blue diamond dial) offers 18k yellow gold construction at 36mm with Sapphire Crystal, Cyclops. Both represent their brand's distinct design philosophy and heritage.

⚙️

Movement & Performance

Edge: Rolex

Automatic Caliber 4R38 vs Automatic, Rolex Calibre 3155

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 Day-Date 18238 (18k yellow gold, blue diamond dial) uses the Automatic, Rolex Calibre 3155 (Rolex 3155, in-house automatic, chronometer, About 48 hours reserve) at standard. The Day-Date 18238 (18k yellow gold, blue diamond dial) offers a longer power reserve.

📏

Wearability & Fit

Edge: Rolex

40.5mm vs 36mm — different wrist presence

At 40.5mm, the Presage SSA425 Open Heart has a bolder wrist presence compared to the Day-Date 18238 (18k yellow gold, blue diamond dial) at 36mm. Water resistance differs: 50m (5 ATM) vs 100m (10 ATM).

💰

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 Day-Date 18238 (18k yellow gold, blue diamond 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, Cyclops and About 48 hours on the Day-Date 18238 (18k yellow gold, blue diamond dial). Service intervals are typically 5-7 years for both.

💧

Water Resistance

Edge: Rolex

50m (5 ATM) vs 100m (10 ATM)

The Presage SSA425 Open Heart is rated to 50m (5 ATM) while the Day-Date 18238 (18k yellow gold, blue diamond dial) handles 100m (10 ATM). The Day-Date 18238 (18k yellow gold, blue diamond 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

Day-Date 18238 (18k yellow gold, blue diamond dial)

Choose the Rolex Day-Date 18238 (18k yellow gold, blue diamond dial) if you value Rolex 3155, in-house automatic, chronometer technology, Swiss Made heritage, and 36mm proportions. At $25,000+, the Automatic, Rolex Calibre 3155 with About 48 hours power reserve makes it a compelling choice.

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The Bottom Line

The Seiko Presage SSA425 Open Heart and Rolex Day-Date 18238 (18k yellow gold, blue diamond 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 Day-Date 18238 (18k yellow gold, blue diamond 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 Day-Date 18238 (18k yellow gold, blue diamond 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 Day-Date 18238 (18k yellow gold, blue diamond dial) at 36mm with 100m (10 ATM) is similarly capable. The Presage SSA425 Open Heart uses Hardlex Crystal while the Day-Date 18238 (18k yellow gold, blue diamond dial) uses Sapphire Crystal, Cyclops.

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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.