Seiko
5 Sports
Made in Japan
Ref. SRPD55
Edition Manufacture
5 Sports
Seiko
5 Sports 5KX
“The gateway drug of mechanical watches. A 100m-rated automatic with a rotating bezel, day-date, and the legendary 4R36 at a price that defies logic.”
From
$285
Approx. retail, verified May 2026 — check retailer for current price
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Ref. SRPD55
Manufacture
Complication
Day, Date
The Editorial
The gateway drug of mechanical watches. A 100m-rated automatic with a rotating bezel, day-date, and the legendary 4R36 at a price that defies logic.
Why This Watch
A piece worth
acquiring.
Ideal for
The first-time automatic buyer. The modder. The enthusiast who wants a canvas for customization.
The 5KX is the most modified watch platform in the world — compatible with thousands of aftermarket parts from dozens of suppliers. But even stock, it delivers 100m water resistance, a rotating bezel, and Seiko's legendary 4R36 movement (hand-windable, hackable, day-date) at under $300. The 5KX is both a finished product and a blank canvas: buy it to wear, buy it to mod, or buy two and do both.
Collector's Note
The aftermarket ecosystem around this watch is staggering — custom dials, bezels, chapter rings, and crystals from dozens of suppliers.
Frequently Asked
Questions About the 5 Sports 5KX
The Seiko 5 Sports 5KX at $285 offers The gateway drug of mechanical watches. A 100m-rated automatic with a rotating bezel, day-date, and the legendary 4R36 at a price that defies logic. It features Automatic Caliber 4R36 and is built to the standards expected of Seiko's manufacturing heritage.
The Seiko 5 Sports 5KX uses the Automatic Caliber 4R36 with 41 Hours of power reserve. The case measures 42.5mm with 100m (10 ATM) water resistance.
The Seiko 5 Sports 5KX (reference SRPD55) retails at approximately $285 USD. Check current pricing through authorized dealers and the secondary market for the best available value.
Yes. The Seiko 5 Sports 5KX is a well-regarded sport watch at the $285 price point. The gateway drug of mechanical watches. A 100m-rated automatic with a rotating bezel, day-date, and the legendary 4R36 at a price that defies logic. It competes favorably with other watches in its category and price range.
The Seiko 5 Sports 5KX has 100m (10 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 5 Sports 5KX Specifications
| Specification | Details |
|---|---|
| Reference | SRPD55 |
| Origin | Made in Japan |
| Case Size | 42.5mm |
| Case Material | Stainless Steel |
| Movement | Automatic Caliber 4R36 |
| 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 | 100m (10 ATM) |
| Complications | Day, Date |
Acquire
Begin your collection
with the Seiko.
Curated from authorized dealers. Authenticated and insured. Available now through Amazon.
Compare
How Does the 5 Sports 5KX Stack Up?
Seiko 5 Sports 5KX vs Tag Heuer Carrera Chronograph
Tag Heuer's chronograph meets Seiko's timepiece
Seiko 5 Sports 5KX vs Tissot PRX Powermatic 80
Two timepieces compared — $850 vs $285
Seiko 5 Sports 5KX vs Breitling Navitimer B01
Breitling's chronograph meets Seiko's timepiece
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Two timepieces compared — $332 vs $285
Seiko 5 Sports 5KX vs Junghans Max Bill Chronoscope
Junghans's chronograph meets Seiko's timepiece
Seiko 5 Sports 5KX vs Tudor Black Bay 58
Tudor's diver meets Seiko's timepiece
Seiko 5 Sports 5KX vs Bulova Devil Diver Oceanographer 96B350
Bulova's diver meets Seiko's timepiece
Seiko 5 Sports 5KX vs Bulova Surveyor Automatic
Bulova's dress watch meets Seiko's timepiece
Seiko 5 Sports 5KX vs Casio Vintage A168WA
Casio's chronograph meets Seiko's timepiece
Seiko 5 Sports 5KX vs Citizen Promaster Sea Eco-Drive Diver
Citizen's diver meets Seiko's timepiece
Seiko 5 Sports 5KX vs Citizen Promaster Air Skyhawk A-T
Citizen's chronograph meets Seiko's timepiece
Seiko 5 Sports 5KX vs Citizen Tsuyosa Automatic (Green Dial)
Two timepieces compared — $332 vs $285
Seiko 5 Sports 5KX vs Frederique Constant Slimline Moonphase Manufacture
Frederique Constant's dress watch meets Seiko's timepiece
Seiko 5 Sports 5KX vs Frederique Constant Classic Quartz Moonphase
Frederique Constant's dress watch meets Seiko's timepiece
Seiko 5 Sports 5KX vs Frederique Constant Highlife Automatic COSC
Two timepieces compared — $1,987 vs $285
Seiko 5 Sports 5KX vs Casio G-Shock GA-B2100 CasiOak
Casio's diver meets Seiko's timepiece
Seiko 5 Sports 5KX vs Hamilton Khaki Field Mechanical 38mm
Hamilton's field watch meets Seiko's timepiece
Seiko 5 Sports 5KX vs Hamilton Intra-Matic Auto Chronograph
Hamilton's chronograph meets Seiko's timepiece
Seiko 5 Sports 5KX vs Hamilton Khaki Aviation Pilot Auto
Hamilton's pilot watch meets Seiko's timepiece
Seiko 5 Sports 5KX vs Hamilton Ventura Quartz
Two timepieces compared — $1,075 vs $285
Seiko 5 Sports 5KX vs Junghans Form A Automatic
Junghans's dress watch meets Seiko's timepiece
Seiko 5 Sports 5KX vs Hamilton Khaki Field Automatic
Hamilton's field watch meets Seiko's timepiece
Seiko 5 Sports 5KX vs Longines HydroConquest Automatic
Longines's diver meets Seiko's timepiece
Seiko 5 Sports 5KX vs Longines Master Collection Moonphase
Longines's dress watch meets Seiko's timepiece
Seiko 5 Sports 5KX vs Bulova Lunar Pilot Chronograph
Bulova's chronograph meets Seiko's timepiece
Seiko 5 Sports 5KX vs Mido Multifort Powerwind Chronometer
Mido's chronograph meets Seiko's timepiece
Seiko 5 Sports 5KX vs Mido Ocean Star GMT
Mido's diver meets Seiko's timepiece
Seiko 5 Sports 5KX vs Orient Bambino Version 2
Orient's dress watch meets Seiko's timepiece
Seiko 5 Sports 5KX vs Orient Kamasu Automatic Diver
Orient's diver meets Seiko's timepiece
Seiko 5 Sports 5KX vs Oris Aquis Date Calibre 400
Oris's diver meets Seiko's timepiece
Seiko 5 Sports 5KX vs Seiko Presage Cocktail Time
Seiko's dress watch meets Seiko's timepiece
Seiko 5 Sports 5KX vs Seiko Presage Cocktail Time SRPE15
Two timepieces compared — $399 vs $285
Seiko 5 Sports 5KX vs Seiko Presage SSA425 Open Heart
Two timepieces compared — $460 vs $285
Seiko 5 Sports 5KX vs Seiko Prospex "Turtle"
Seiko's diver meets Seiko's timepiece
Seiko 5 Sports 5KX vs Tissot PRX Powermatic 80 35mm
Two timepieces compared — $795 vs $285
Seiko 5 Sports 5KX vs Timex Q Timex Reissue
Timex's diver meets Seiko's timepiece
Seiko 5 Sports 5KX vs Rado True Square Automatic
Two timepieces compared — $2,450 vs $285
Seiko 5 Sports 5KX vs Raymond Weil Freelancer Open Heart
Two timepieces compared — $1,570 vs $285
Seiko 5 Sports 5KX vs Seiko 5 Sports GMT SSK001
Seiko's GMT watch meets Seiko's timepiece
Seiko 5 Sports 5KX vs Seiko Prospex Alpinist
Seiko's timepiece meets Seiko's diver
Seiko 5 Sports 5KX vs Seiko Prospex Samurai SRPL13
Seiko's timepiece meets Seiko's diver
Seiko 5 Sports 5KX vs Tag Heuer Aquaracer Professional 300
Seiko's timepiece meets Tag Heuer's diver
Seiko 5 Sports 5KX vs Timex Marlin Automatic 40mm
Two timepieces compared — $285 vs $256
Seiko 5 Sports 5KX vs Tissot Chemin des Tourelles Powermatic 80
Seiko's timepiece meets Tissot's dress watch
Seiko 5 Sports 5KX vs Tissot Seastar 1000 Automatic
Seiko's timepiece meets Tissot's diver
Seiko 5 Sports 5KX vs Zenith Chronomaster El Primero
Seiko's timepiece meets Zenith's chronograph