The Seiko Prospex SRPE33—also listed in some markets as the SRPE33K1—is a 200 m diver with a manta-ray-inspired blue wave dial, sapphire crystal and Seiko’s 4R35 automatic movement. Its 43.8 mm case and 48.7 mm lug-to-lug length are important fit considerations; the factory water-resistance rating is not a substitute for testing an older or pre-owned watch before diving.
What is the Seiko SRPE33K1?
SRPE33 is Seiko’s model reference for this Prospex Save the Ocean Special Edition diver. Regional listings also use the spelling SRPE33K1, so check the reference shown by the seller and on the watch rather than assuming that every Save the Ocean model has the same dial or specifications. Seiko describes this version’s blue gradient dial and stamped wave pattern as inspired by manta rays and the ocean.
Seiko’s global product specifications identify the watch as SRPE33. The Seiko USA listing describes its manta-ray-themed dial.
Seiko SRPE33 specifications
| Specification | Published detail |
|---|---|
| Reference | SRPE33; SRPE33K1 appears on some regional listings |
| Movement | Seiko 4R35 automatic with manual winding; 23 jewels |
| Power reserve | Approximately 41 hours |
| Functions | Date display and stop-second function; Seiko USA lists 21,600 vibrations per hour |
| Case | Stainless steel |
| Diameter | 43.8 mm on Seiko’s global specifications; rounded to 44 mm on the US page |
| Thickness | 12.8 mm on the global page; 12.81 mm on the US page |
| Lug-to-lug | 48.7 mm |
| Distance between lugs | 22 mm |
| Crystal | Sapphire with anti-reflective coating on the inner surface |
| Bezel | One-way rotating elapsed-time bezel; Seiko USA specifies a black ceramic insert |
| Water resistance | 200 m / 660 ft diver’s water resistance |
| Bracelet | Stainless steel, with a secure-lock three-fold clasp, push-button release and extender listed on Seiko’s global page |
| Luminescence | LumiBrite on hands, indexes and bezel |
These are manufacturer-published specifications, not independent measurements. Regional pages may round dimensions or use a different reference suffix.
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- WATER-RESISTANT: these water-resistant men's dive watches are ISO scuba-approved to depths of 200 meters
- AUTOMATIC: these self-winding, automatic men's watches are powered by your movement, with a power reserve of 41 hours
- STAINLESS STEEL: features a durable 43.8mm stainless steel watch case and bracelet.
- LUMIBRITE DISPLAY: this men's automatic watch features a highly-legible display with LumiBrite hands and markers
- 4R35 CALIBER: equipped with the reliable caliber 4R35 automatic movement, this accurate men's watch keeps precise time
How large is it, and what strap fits?
The case measures 43.8 mm across and 48.7 mm from lug to lug. Those figures are more useful for judging wrist fit than diameter alone: compare the lug-to-lug length with a watch you already know fits you. The listed thickness is 12.8 mm. Seiko’s US page rounds the diameter to 44 mm and gives thickness as 12.81 mm.
The space between the lugs is 22 mm, so a 22 mm strap is the starting point when shopping for a replacement. That measurement does not guarantee that every strap’s end shape, spring bars or clasp will fit the watch. Check compatibility with the exact reference. If you plan to resize the supplied bracelet and are not comfortable doing it, use a competent watchmaker.
Rank #2
- AUTOMATIC MOVEMENT: Seiko 4R35 automatic movement includes manual winding, 23 jewels, date display, stop-second function, and approximately 41 hours of power reserve.
- 200M DIVER'S WATER RESISTANCE: Rated to 200 meters / 660 feet for diving, with a screw-down crown and screw case back.
- STAINLESS-STEEL CASE: 41.7mm stainless-steel case measures 12.3mm thick with a 49.5mm lug-to-lug distance and 20mm lug width.
- HARDLEX CRYSTAL: Durable Hardlex crystal protects the dial, while LumiBrite on the hands, indexes, and bezel improves low-light visibility.
- DIVER-READY DESIGN: Unidirectional rotating bezel and three-fold clasp with secure lock, push-button release, and extender provide practical functionality.
Is the SRPE33 suitable for diving?
Seiko rates the SRPE33 at 200 m / 660 ft diver’s water resistance. Seiko USA says the design follows ISO standards for scuba diving and describes it as having a secure screw-down crown and caseback. That is the manufacturer’s product claim; it does not confirm the condition of an individual watch.
For a pre-owned watch—or one that has been damaged, opened or left unserviced—do not treat the rating printed in its specifications as proof that it remains watertight. Have it inspected and pressure-tested by a qualified watch service provider before taking it scuba diving. A current test matters more than the age of the model’s published rating.
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Rank #3
- STUNNING BLUE DIAL: this rugged sports watch features a beautiful Manta Ray-patterned blue dial, with Lumibrite dial indicator hands and markers for low light and a magnified day/date calendar
- BLACK BEZEL: this versatile men’s watch features a black ceramic unidirectional bezel with distinctive scalloped edging, for elapsed timing
- AUTOMATIC & MANUAL: SRPF77 automatic watches for men power up with your natural movements, and feature the ability to wind manually, with 41 hours of reserve power
- WATER-RESISTANT: these rugged stainless steel dive watches for men feature a deep blue silicone strap and are both stylish and robust, following ISO standards for scuba, and are water-resistant to 200 meters
- 4R36 CALIBER: equipped with the reliable 4R36 caliber, these precise men’s wrist watches ensure the most accurate timekeeping
Movement, dial and construction
4R35 automatic movement
The 4R35 is automatic and can also be wound by hand. Seiko lists an approximately 41-hour power reserve, 23 jewels, a date display and a stop-second function. Seiko USA specifies a frequency of 21,600 vibrations per hour. These published details describe the movement; they do not establish an individual watch’s accuracy or reliability.
Ocean-inspired design
The blue gradient dial has a stamped wave pattern, with Seiko describing the design as manta-ray inspired. A magnified date sits beneath the sapphire crystal. The black ceramic bezel insert is unidirectional, and the bracelet is stainless steel. Seiko lists LumiBrite on the hands, indexes and bezel, and an anti-reflective coating on the inner face of the sapphire crystal.
Rank #4
- WATER-RESISTANT: these water-resistant men's dive watches are ISO scuba-approved to depths of 200 meters
- AUTOMATIC: these self-winding, automatic men's watches are powered by your movement, with a power reserve of 41 hours
- LUMIBRITE DISPLAY: this men's dive watch features a highly-legible display with LumiBrite hands and markers
- STAINLESS STEEL: features a durable stainless steel watch case and bracelet, unique case shape resembling teeth, and PADI red and blue colors on its elapsed timing bezel
- 4R36 CALIBER: equipped with the reliable caliber 4R36 automatic movement, this accurate men's watch keeps precise time
How much does the Seiko SRPE33 cost?
Prices depend on market and can change. At the time the regional product pages were retrieved, Seiko USA listed the watch at $650, Seiko India showed an MRP of ₹70,000 inclusive of taxes, and Seiko Boutique Malaysia listed RM 2,880 while marking the page out of stock. These are regional listing details, not a universal price or confirmation of current inventory. Check the applicable official Seiko page and the seller’s current price and stock before buying.
Quick Recap
Best Value
- PADI SPECIAL EDITION: Men's Prospex Sea diver featuring a PADI Special Edition design with a stainless-steel case and ceramic bezel display.
- AUTOMATIC MOVEMENT: Seiko 4R36 automatic movement offers manual winding, 24 jewels, day/date display, stop-second function, and approximately 41 hours of power reserve.
- 200M DIVER'S WATER RESISTANCE: Rated to 200 meters / 660 feet for diving, with a screw-down crown and screw case back.
- SAPPHIRE CRYSTAL: Sapphire crystal with magnifier and inner anti-reflective coating provides durable dial protection and improved readability.
- DIVER-READY FEATURES: 45mm stainless-steel case, unidirectional rotating bezel, LumiBrite hands, indexes and bezel, plus a secure three-fold clasp with extender.
What to check before buying
- Confirm the reference: Listings may say SRPE33 or SRPE33K1. Make sure the pictured dial and watch match the reference being offered.
- Assess the fit: Consider the 43.8 mm diameter, 48.7 mm lug-to-lug length and 12.8 mm thickness, not diameter alone.
- Check condition: For a used example, ask about service history and arrange a pressure test before any diving use.
- Verify the details locally: Confirm the price, stock, included bracelet and seller terms in your market; regional specifications and listings can differ.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
