Updated
Breguet Heritage 3660BB (18k white gold, tonneau, silver engine-turned dial) vs Seiko Presage SSA425 Open Heart
Two timepieces compared — $10,000–$25,000 vs $250–$500
Quick Verdict
The Seiko Presage SSA425 Open Heart ($250–$500) delivers Seiko In-House Automatic technology in the tier below the Breguet Heritage 3660BB (18k white gold, tonneau, silver engine-turned dial) ($10,000–$25,000). The Presage SSA425 Open Heart measures 40.5mm and is rated 50m (5 ATM). The Heritage 3660BB (18k white gold, tonneau, silver engine-turned dial) justifies its premium with Swiss Made heritage and Automatic, Breguet calibre 532 (curved to the case). Both represent excellent choices in the timepiece category.
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Breguet
Heritage 3660BB (18k white gold, tonneau, silver engine-turned dial)
$10,000–$25,000
Specifications Compared
| Feature | Breguet Heritage 3660BB (18k white gold, tonneau, silver engine-turned dial) | Seiko Presage SSA425 Open Heart |
|---|---|---|
| Price | $10,000–$25,000 | $250–$500 |
| Case Size | 35 x 29.6mm, curved tonneau | 40.5mm |
| Movement | Automatic, Breguet calibre 532 (curved to the case) | Automatic Caliber 4R38 |
| Caliber Type | Breguet 532, per Breguet for the Heritage 3660 | Seiko In-House Automatic |
| Power Reserve | About 40 hours | 41 Hours |
| Water Resistance | 30m (3 ATM) | 50m (5 ATM) |
| Crystal | Sapphire Crystal, curved | Hardlex Crystal |
| Case Material | 18k white gold, fluted caseband | Stainless Steel |
| Origin | Swiss Made | Made in Japan |
Category-by-Category Analysis
Design & Aesthetics
Breguet's design language vs Seiko's approach
The Breguet Heritage 3660BB (18k white gold, tonneau, silver engine-turned dial) features a 18k white gold, fluted caseband case at 35 x 29.6mm, curved tonneau with Sapphire Crystal, curved protection. The Seiko Presage SSA425 Open Heart offers Stainless Steel construction at 40.5mm with Hardlex Crystal. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic, Breguet calibre 532 (curved to the case) vs Automatic Caliber 4R38
The Heritage 3660BB (18k white gold, tonneau, silver engine-turned dial) runs the Automatic, Breguet calibre 532 (curved to the case) (Breguet 532, per Breguet for the Heritage 3660, About 40 hours power reserve) at standard frequency. The Presage SSA425 Open Heart uses the Automatic Caliber 4R38 (Seiko In-House Automatic, 41 Hours reserve) at 21,600 vph (3 Hz). The Presage SSA425 Open Heart offers a longer power reserve.
Wearability & Fit
35 x 29.6mm, curved tonneau vs 40.5mm — different wrist presence
At 35 x 29.6mm, curved tonneau, the Heritage 3660BB (18k white gold, tonneau, silver engine-turned dial) wears more compactly on smaller wrists compared to the Presage SSA425 Open Heart at 40.5mm. Water resistance differs: 30m (3 ATM) vs 50m (5 ATM).
Value & Cost of Ownership
Seiko sits in the lower tier
The Breguet Heritage 3660BB (18k white gold, tonneau, silver engine-turned dial) sits at $10,000–$25,000 and the Seiko Presage SSA425 Open Heart at $250–$500. On the specs that outlast any price: the Heritage 3660BB (18k white gold, tonneau, silver engine-turned dial) uses Sapphire Crystal, curved with About 40 hours, against Hardlex Crystal and 41 Hours on the Presage SSA425 Open Heart. Service intervals are typically 5-7 years for both.
Water Resistance
30m (3 ATM) vs 50m (5 ATM)
The Heritage 3660BB (18k white gold, tonneau, silver engine-turned dial) is rated to 30m (3 ATM) while the Presage SSA425 Open Heart handles 50m (5 ATM). The Presage SSA425 Open Heart offers superior water resistance.
Our Verdict
Breguet
Heritage 3660BB (18k white gold, tonneau, silver engine-turned dial)
Choose the Breguet Heritage 3660BB (18k white gold, tonneau, silver engine-turned dial) if you prioritize Breguet 532, per Breguet for the Heritage 3660 engineering, Swiss Made craftsmanship, and 30m (3 ATM) water resistance. At $10,000–$25,000, it delivers Automatic, Breguet calibre 532 (curved to the case) with About 40 hours power reserve.
Check Price on AmazonSeiko
Presage SSA425 Open Heart
Choose the Seiko Presage SSA425 Open Heart if you value Seiko In-House Automatic technology, Made in Japan heritage, and 40.5mm proportions. At $250–$500, the Automatic Caliber 4R38 with 41 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Breguet Heritage 3660BB (18k white gold, tonneau, silver engine-turned dial) and Seiko Presage SSA425 Open Heart represent two distinct approaches to the timepiece category — the Breguet bringing Swiss Made tradition while Seiko delivers Made in Japan engineering.
Frequently Asked Questions
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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.