Head-to-Head Comparison

Updated September 5, 2026

Seiko Presage SSA425 Open Heart vs Tudor Black Bay 41 S&G M79683-0001 (steel and yellow gold, black dial, two-tone bracelet)

Seiko's timepiece meets Tudor's chronograph

Quick Verdict

The Seiko Presage SSA425 Open Heart ($250–$500) offers Seiko In-House Automatic precision in the tier below the Tudor Black Bay 41 S&G M79683-0001 (steel and yellow gold, black dial, two-tone bracelet) ($5,000–$10,000). The Presage SSA425 Open Heart measures 40.5mm and is rated 50m (5 ATM). The Black Bay 41 S&G M79683-0001 (steel and yellow gold, black dial, two-tone bracelet) counters with Swiss Made craftsmanship and 100m (10 ATM) water resistance. Both are exceptional watches for their respective tiers.

SeikoPresage SSA425 Open Heart$250–$500 Check price TudorBlack Bay 41 S&G M79683-0001 (steel and yellow gold, black dial, two-tone bracelet)$5,000–$10,000 Check price

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Seiko

Presage SSA425 Open Heart

$250–$500

Check Price Full Review

Tudor

Black Bay 41 S&G M79683-0001 (steel and yellow gold, black dial, two-tone bracelet)

$5,000–$10,000

Check Price Full Review

Specifications Compared

Feature	Seiko Presage SSA425 Open Heart	Tudor Black Bay 41 S&G M79683-0001 (steel and yellow gold, black dial, two-tone bracelet)
Price	$250–$500	$5,000–$10,000
Case Size	40.5mm	41mm, 12.2mm thick, 22mm lugs
Movement	Automatic Caliber 4R38	Manufacture calibre MT5601, automatic, COSC chronometer, bidirectional rotor
Caliber Type	Seiko In-House Automatic	Tudor manufacture MT5601, COSC chronometer
Power Reserve	41 Hours	About 70 hours
Water Resistance	50m (5 ATM)	100m (10 ATM)
Crystal	Hardlex Crystal	Sapphire Crystal
Case Material	Stainless Steel	Stainless steel, polished and satin; fixed bezel in steel capped with 0.3mm of yellow gold; screw-down crown capped with 0.1mm of yellow gold; solid caseback
Origin	Made in Japan	Swiss Made

Category-by-Category Analysis

🎨

Design & Aesthetics

Edge: Draw

Seiko's design language vs Tudor's approach

The Seiko Presage SSA425 Open Heart features a Stainless Steel case at 40.5mm with Hardlex Crystal protection. The Tudor Black Bay 41 S&G M79683-0001 (steel and yellow gold, black dial, two-tone bracelet) offers Stainless steel, polished and satin; fixed bezel in steel capped with 0.3mm of yellow gold; screw-down crown capped with 0.1mm of yellow gold; solid caseback construction at 41mm, 12.2mm thick, 22mm lugs with Sapphire Crystal. Both represent their brand's distinct design philosophy and heritage.

⚙️

Movement & Performance

Edge: Tudor

Automatic Caliber 4R38 vs Manufacture calibre MT5601, automatic, COSC chronometer, bidirectional rotor

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 Black Bay 41 S&G M79683-0001 (steel and yellow gold, black dial, two-tone bracelet) uses the Manufacture calibre MT5601, automatic, COSC chronometer, bidirectional rotor (Tudor manufacture MT5601, COSC chronometer, About 70 hours reserve) at standard. The Black Bay 41 S&G M79683-0001 (steel and yellow gold, black dial, two-tone bracelet) offers a longer power reserve.

📏

Wearability & Fit

Edge: Seiko

40.5mm vs 41mm, 12.2mm thick, 22mm lugs — different wrist presence

At 40.5mm, the Presage SSA425 Open Heart wears more compactly on smaller wrists compared to the Black Bay 41 S&G M79683-0001 (steel and yellow gold, black dial, two-tone bracelet) at 41mm, 12.2mm thick, 22mm lugs. 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 Tudor Black Bay 41 S&G M79683-0001 (steel and yellow gold, black dial, two-tone bracelet) at $5,000–$10,000. On the specs that outlast any price: the Presage SSA425 Open Heart uses Hardlex Crystal with 41 Hours, against Sapphire Crystal and About 70 hours on the Black Bay 41 S&G M79683-0001 (steel and yellow gold, black dial, two-tone bracelet). Service intervals are typically 5-7 years for both.

💧

Water Resistance

Edge: Tudor

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

The Presage SSA425 Open Heart is rated to 50m (5 ATM) while the Black Bay 41 S&G M79683-0001 (steel and yellow gold, black dial, two-tone bracelet) handles 100m (10 ATM). The Black Bay 41 S&G M79683-0001 (steel and yellow gold, black dial, two-tone bracelet) 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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Tudor

Black Bay 41 S&G M79683-0001 (steel and yellow gold, black dial, two-tone bracelet)

Choose the Tudor Black Bay 41 S&G M79683-0001 (steel and yellow gold, black dial, two-tone bracelet) if you value Tudor manufacture MT5601, COSC chronometer technology, Swiss Made heritage, and 41mm, 12.2mm thick, 22mm lugs proportions. At $5,000–$10,000, the Manufacture calibre MT5601, automatic, COSC chronometer, bidirectional rotor with About 70 hours power reserve makes it a compelling choice.

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The Bottom Line

The Seiko Presage SSA425 Open Heart and Tudor Black Bay 41 S&G M79683-0001 (steel and yellow gold, black dial, two-tone bracelet) represent two distinct approaches to fine watchmaking — the Seiko bringing Made in Japan tradition while Tudor delivers Swiss Made engineering.

Frequently Asked Questions

For water, the Tudor Black Bay 41 S&G M79683-0001 (steel and yellow gold, black dial, two-tone bracelet) 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 $5,000–$10,000), 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 Tudor Black Bay 41 S&G M79683-0001 (steel and yellow gold, black dial, two-tone bracelet) 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 Black Bay 41 S&G M79683-0001 (steel and yellow gold, black dial, two-tone bracelet) at 41mm, 12.2mm thick, 22mm lugs with 100m (10 ATM) is similarly capable. The Presage SSA425 Open Heart uses Hardlex Crystal while the Black Bay 41 S&G M79683-0001 (steel and yellow gold, black dial, two-tone bracelet) 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.