Seiko
Presage
Made in Japan
Ref. SSA425
Edition Manufacture
Presage
Seiko
Presage SSA425 Open Heart
“A window into the soul of the watch. The open-aperture dial reveals the beating balance wheel in real time — mechanical poetry at a price that makes Swiss open-hearts look like highway robbery.”
From
$460
Approx. retail, verified May 2026 — check retailer for current price
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Ref. SSA425
Manufacture
Complication
Open Heart, Date, 24-Hour Subdial
The Editorial
A window into the soul of the watch. The open-aperture dial reveals the beating balance wheel in real time — mechanical poetry at a price that makes Swiss open-hearts look like highway robbery.
Why This Watch
A piece worth
acquiring.
Ideal for
The romantic. The buyer who wants to show off what's inside. The collector who appreciates the spectacle of mechanical movement.
Swiss open-heart watches start at $1,500. Seiko does it at $460 — and the dial finishing is competitive with watches at three times the price. The SSA425's open aperture reveals the balance wheel in constant motion, turning your wrist into a living display of mechanical engineering.
Collector's Note
Open-heart watches are polarizing — you either find them mesmerizing or busy. If you're in the first camp, this is the best value open-heart on the market.
Frequently Asked
Questions About the Presage SSA425 Open Heart
The Seiko Presage SSA425 Open Heart at $460 offers A window into the soul of the watch. The open-aperture dial reveals the beating balance wheel in real time — mechanical poetry at a price that makes Swiss open-hearts look like highway robbery. It features Automatic Caliber 4R38 and is built to the standards expected of Seiko's manufacturing heritage.
The Seiko Presage SSA425 Open Heart uses the Automatic Caliber 4R38 with 41 Hours of power reserve. The case measures 40.5mm with 50m (5 ATM) water resistance.
The Seiko Presage SSA425 Open Heart (reference SSA425) retails at approximately $460 USD. Check current pricing through authorized dealers and the secondary market for the best available value.
Yes. The Seiko Presage SSA425 Open Heart is a well-regarded dress watch at the $460 price point. A window into the soul of the watch. The open-aperture dial reveals the beating balance wheel in real time — mechanical poetry at a price that makes Swiss open-hearts look like highway robbery. It competes favorably with other watches in its category and price range.
The Seiko Presage SSA425 Open Heart has 50m (5 ATM). It is suitable for everyday wear including hand washing and rain exposure.
Luminescence
Legibility in
Absolute Darkness.
Experience the breathtaking clarity of Swiss Super-LumiNova. Use the interactive flashlight to reveal the glowing indices and hands engineered for optimal legibility in the most extreme conditions.
Hover to Reveal Lume
The Maison
Seiko
“Always One Step Ahead”
Founded
1881
Origin
Tokyo, Japan
House Style
Vertically integrated manufacture, dial craft (Zaratsu polish, enamel, urushi), engineering depth.
The Japanese house that disrupted Swiss watchmaking — and still does.
Founded by Kintarō Hattori, Seiko produced Japan's first wristwatch in 1913 and the world's first quartz watch in 1969 — triggering the quartz crisis. The Prospex dive collection traces directly to the 1965 62MAS, the first Japanese dive watch. The Presage and Alpinist lines showcase Japan's mastery of dial craftsmanship.
Technical Prowess
Seiko Presage SSA425 Open Heart Specifications
| Specification | Details |
|---|---|
| Reference | SSA425 |
| Origin | Made in Japan |
| Case Size | 40.5mm |
| Case Material | Stainless Steel |
| Movement | Automatic Caliber 4R38 |
| Caliber Class | Seiko In-House Automatic |
| Frequency | 21,600 vph (3 Hz) |
| Jewel Count | 24 Jewels |
| Power Reserve | 41 Hours |
| Crystal | Hardlex Crystal |
| Water Resistance | 50m (5 ATM) |
| Complications | Open Heart, Date, 24-Hour Subdial |
Acquire
Begin your collection
with the Seiko.
Curated from authorized dealers. Authenticated and insured. Available now through Amazon.
Compare
How Does the Presage SSA425 Open Heart Stack Up?
Seiko Presage SSA425 Open Heart vs Tag Heuer Carrera Chronograph
Tag Heuer's chronograph meets Seiko's timepiece
Seiko Presage SSA425 Open Heart vs Tissot PRX Powermatic 80
Two timepieces compared — $850 vs $460
Seiko Presage SSA425 Open Heart vs Breitling Navitimer B01
Breitling's chronograph meets Seiko's timepiece
Seiko Presage SSA425 Open Heart vs Citizen Tsuyosa Automatic
Two timepieces compared — $332 vs $460
Seiko Presage SSA425 Open Heart vs Junghans Max Bill Chronoscope
Junghans's chronograph meets Seiko's timepiece
Seiko Presage SSA425 Open Heart vs Tudor Black Bay 58
Tudor's diver meets Seiko's timepiece
Seiko Presage SSA425 Open Heart vs Bulova Devil Diver Oceanographer 96B350
Bulova's diver meets Seiko's timepiece
Seiko Presage SSA425 Open Heart vs Bulova Surveyor Automatic
Bulova's dress watch meets Seiko's timepiece
Seiko Presage SSA425 Open Heart vs Casio Vintage A168WA
Casio's chronograph meets Seiko's timepiece
Seiko Presage SSA425 Open Heart vs Citizen Promaster Sea Eco-Drive Diver
Citizen's diver meets Seiko's timepiece
Seiko Presage SSA425 Open Heart vs Citizen Promaster Air Skyhawk A-T
Citizen's chronograph meets Seiko's timepiece
Seiko Presage SSA425 Open Heart vs Citizen Tsuyosa Automatic (Green Dial)
Two timepieces compared — $332 vs $460
Seiko Presage SSA425 Open Heart vs Frederique Constant Slimline Moonphase Manufacture
Frederique Constant's dress watch meets Seiko's timepiece
Seiko Presage SSA425 Open Heart vs Frederique Constant Classic Quartz Moonphase
Frederique Constant's dress watch meets Seiko's timepiece
Seiko Presage SSA425 Open Heart vs Frederique Constant Highlife Automatic COSC
Two timepieces compared — $1,987 vs $460
Seiko Presage SSA425 Open Heart vs Casio G-Shock GA-B2100 CasiOak
Casio's diver meets Seiko's timepiece
Seiko Presage SSA425 Open Heart vs Hamilton Khaki Field Mechanical 38mm
Hamilton's field watch meets Seiko's timepiece
Seiko Presage SSA425 Open Heart vs Hamilton Intra-Matic Auto Chronograph
Hamilton's chronograph meets Seiko's timepiece
Seiko Presage SSA425 Open Heart vs Hamilton Khaki Aviation Pilot Auto
Hamilton's pilot watch meets Seiko's timepiece
Seiko Presage SSA425 Open Heart vs Hamilton Ventura Quartz
Two timepieces compared — $1,075 vs $460
Seiko Presage SSA425 Open Heart vs Junghans Form A Automatic
Junghans's dress watch meets Seiko's timepiece
Seiko Presage SSA425 Open Heart vs Hamilton Khaki Field Automatic
Hamilton's field watch meets Seiko's timepiece
Seiko Presage SSA425 Open Heart vs Longines HydroConquest Automatic
Longines's diver meets Seiko's timepiece
Seiko Presage SSA425 Open Heart vs Longines Master Collection Moonphase
Longines's dress watch meets Seiko's timepiece
Seiko Presage SSA425 Open Heart vs Bulova Lunar Pilot Chronograph
Bulova's chronograph meets Seiko's timepiece
Seiko Presage SSA425 Open Heart vs Mido Multifort Powerwind Chronometer
Mido's chronograph meets Seiko's timepiece
Seiko Presage SSA425 Open Heart vs Mido Ocean Star GMT
Mido's diver meets Seiko's timepiece
Seiko Presage SSA425 Open Heart vs Orient Bambino Version 2
Orient's dress watch meets Seiko's timepiece
Seiko Presage SSA425 Open Heart vs Orient Kamasu Automatic Diver
Orient's diver meets Seiko's timepiece
Seiko Presage SSA425 Open Heart vs Oris Aquis Date Calibre 400
Oris's diver meets Seiko's timepiece
Seiko Presage SSA425 Open Heart vs Seiko Presage Cocktail Time
Seiko's dress watch meets Seiko's timepiece
Seiko Presage SSA425 Open Heart vs Seiko Presage Cocktail Time SRPE15
Two timepieces compared — $399 vs $460
Seiko Presage SSA425 Open Heart vs Seiko Prospex "Turtle"
Seiko's timepiece meets Seiko's diver
Seiko Presage SSA425 Open Heart vs Tissot PRX Powermatic 80 35mm
Two timepieces compared — $460 vs $795
Seiko Presage SSA425 Open Heart vs Timex Q Timex Reissue
Seiko's timepiece meets Timex's diver
Seiko Presage SSA425 Open Heart vs Rado True Square Automatic
Two timepieces compared — $460 vs $2,450
Seiko Presage SSA425 Open Heart vs Raymond Weil Freelancer Open Heart
Two timepieces compared — $460 vs $1,570
Seiko Presage SSA425 Open Heart vs Seiko 5 Sports GMT SSK001
Seiko's timepiece meets Seiko's GMT watch
Seiko Presage SSA425 Open Heart vs Seiko 5 Sports 5KX
Two timepieces compared — $460 vs $285
Seiko Presage SSA425 Open Heart vs Seiko Prospex Alpinist
Seiko's timepiece meets Seiko's diver
Seiko Presage SSA425 Open Heart vs Seiko Prospex Samurai SRPL13
Seiko's timepiece meets Seiko's diver
Seiko Presage SSA425 Open Heart vs Tag Heuer Aquaracer Professional 300
Seiko's timepiece meets Tag Heuer's diver
Seiko Presage SSA425 Open Heart vs Timex Marlin Automatic 40mm
Two timepieces compared — $460 vs $256
Seiko Presage SSA425 Open Heart vs Tissot Chemin des Tourelles Powermatic 80
Seiko's timepiece meets Tissot's dress watch
Seiko Presage SSA425 Open Heart vs Tissot Seastar 1000 Automatic
Seiko's timepiece meets Tissot's diver
Seiko Presage SSA425 Open Heart vs Zenith Chronomaster El Primero
Seiko's timepiece meets Zenith's chronograph