The Seiko Prospex SRPB11 (Japan reference SRPB11J1) is the Blue Lagoon limited-edition Turtle — a cushion-case automatic diver with a vivid blue sunray dial and a two-tone blue unidirectional bezel. It was released as a worldwide limited run of 6,000 pieces and sits in the modern Prospex Turtle family collectors already know from PADI and standard SRP/SRPE Turtles.
On the wrist it reads as a proper tool diver that still feels playful. White and silver hands and indices sit over a blue dial that shifts with the light; turquoise and deeper blue on the bezel echo the “Blue Lagoon” name. Day and date are driven by the workhorse 4R36 automatic. The crown stays at 4 o’clock on the classic Turtle case, which keeps the watch comfortable despite the large diameter.
Condition note: please review the photos for the limited edition box — outer packaging may show age while the watch remains the focus of the listing.
Why the Blue Lagoon Turtle stands out
- Limited Prospex colourway — dual blue bezel and sunray blue dial in a numbered limited series (6,000 worldwide at launch).
- Iconic Turtle case — cushion silhouette with 4 o’clock crown, steel bracelet, and dive-ready hardware.
- 4R36 automatic — day and date, hand-wind, hacking seconds, about 41 hours power reserve, 24 jewels.
- 200 m water resistance — screw-down crown and unidirectional bezel for recreational dive use when the watch is correctly maintained.
- Japan-made SRPB11J1 coding — the J1 suffix marks the Japan-market / Japan-made packaging path collectors often search for.
Who it suits
Divers and Seiko collectors who want a colour-led limited Turtle rather than a black or monochrome bezel. It works as a weekend sports watch and a display piece. If you need a smaller dress watch, choose a Seiko 5 or Presage; if you want this exact Blue Lagoon look and limited case-back story, SRPB11 / SRPB11J1 is the reference.
Key specifications
- Brand / collection: Seiko Prospex, Turtle (Blue Lagoon limited edition)
- References: SRPB11 / SRPB11J1
- Limitation: 6,000 pieces worldwide at release; case back marked limited edition
- Movement: Seiko automatic calibre 4R36, 24 jewels, ~21,600 bph, hand-wind and hacking, ~41-hour power reserve
- Functions: hours, minutes, seconds, day, date
- Case: stainless steel cushion “Turtle” case, about 44.3 mm diameter (some round-ups list ~45 mm), about 13.2 mm thick on our attribute data
- Lug-to-lug: about 47.7 mm
- Crystal: Hardlex mineral
- Bezel: unidirectional rotating, dual blue (deep blue / turquoise lagoon tones)
- Dial: blue sunray with luminous hands and markers
- Crown: screw-down at 4 o’clock
- Case back: screw-down with limited edition marking
- Bracelet: stainless steel, about 22 mm lug width, deployment clasp
- Water resistance: 200 metres (20 bar)
Authentic stock, inspected before dispatch. Free shipping Australia-wide on eligible orders. Covered by Chronospride’s 12 months warranty, handled by our team. See our authenticity and warranty page.
Frequently asked questions
What is the Seiko SRPB11 Blue Lagoon Turtle?
It is a limited-edition Prospex Turtle diver with a blue sunray dial and two-tone blue bezel, released with a worldwide run of 6,000 pieces. SRPB11J1 is the Japan-coded reference for the same Blue Lagoon Turtle family.
What movement does the SRPB11J1 use?
Seiko calibre 4R36 automatic: 24 jewels, day and date, hand-winding, hacking seconds, and about 41 hours of power reserve.
What is the water resistance of the Blue Lagoon Turtle?
200 metres (20 bar), with a screw-down crown and unidirectional dive bezel. Keep gaskets serviced if you use it in the water regularly.
How big is the SRPB11 Turtle on the wrist?
Case diameter is about 44.3 mm with roughly 13.2 mm thickness and about 47.7 mm lug-to-lug on our store attributes. The cushion case and 4 o’clock crown often wear more comfortably than a round case of the same diameter, but it is still a large sports watch.
Is the Blue Lagoon Turtle the same as the PADI Turtle?
No. Both are Prospex Turtle divers, but the PADI editions use PADI colour branding (commonly blue dial with red/blue “Pepsi-style” bezel cues). Blue Lagoon uses the dual blue / turquoise lagoon bezel theme without PADI logos.
Where can I buy the Seiko SRPB11J1 in Australia?
When this product shows in stock, you can order it from Chronospride on this page. We inspect stock before dispatch, offer free shipping Australia-wide on eligible orders, and cover purchases with Chronospride’s 12 months warranty handled by our team. Review the photos for box condition before you buy.
| Brand | Seiko |
|---|---|
| Case-Size | 44.3mm |
| Lug-Width | 22mm |
| Lug to lug size | 47.7mm |
| Case Thickness | 13.2mm |
| MPN | SRPB11J1 |
| Band-Colour | Silver |
| Band-Material | Stainless Steel |
| Case-Material | Stainless Steel |
| Case-Colour | Silver |
| Calibre | 4R36 |
| Face-Colour | Blue |
| Gender | Men's |
| GTIN | 4954628438492 |
| UPC | 4954628213105 |
| Movement | Automatic |
| Watch-Shape | Round |
| Water-Resistance-Rating | 200 m (20 ATM) |
| Power reserve | 41 hours |
| Band-Width | 22mm |
| EAN | 4954628213105 |
| Jewels | 24 |