New Releases Watches

A Trio of Seiko Prospex ‘Great Blue’ Scuba PADI Divers Expand the Conservation Collection

Seiko Prospex Great Blue Samurai Turtle Sumo PADI Special Edition SPB375 SRPK01 SRPJ93

For years now Seiko has contributed to global ocean conservation projects through the Save the Ocean collections and their collaborations with PADI, the Professional Association of Diving Instructors. Proceeds from the PADI collaboration watches go towards the PADI Ocean Cleanup Campaign and for 2023, Seiko’s range of PADI watches is expanding with the new Prospex ‘Great Blue’ Scuba PADI Divers collection.

Seiko Prospex Great Blue Samurai Turtle Sumo PADI Special Edition SPB375 SRPK01 SRPJ93

The new collection is formed of a trio of Seiko diving watches with aquatic themed dials. They’re the ‘Great Blue’ Turtle Scuba, Sumo Scuba and Samurai Scuba and each has the signature case associated with their names. Meaning the Turtle has a 45mm case with smooth, curved edges, while the Sumo is 45mm with a facetted, round shape and the Samurai has a 43.8mm, sword-sharp, angular case.

Seiko Prospex Great Blue Sumo Scuba PADI Special Edition SPB375J1

Seiko Prospex ‘Great Blue’ Sumo Scuba PADI SPB375J1

But we’ve seen these cases before. What makes the ‘Great Blue’ Scuba PADI watches stand out are the dials. Each of them is a vertical gradient from dark blue to light, creating the impression of oceanic depth, which isn’t uncommon for dive watches. However, what makes these next-level is the addition of asymmetrical wave patterns across the top half of the dials that imitate the view of scuba divers looking up at the surface of the water with the sun beating down. It looks fantastic. The wave pattern is technically identical on all three watches but slight deviations in colour make them each look unique.

Seiko Prospex Great Blue Samurai Scuba PADI Special Edition SRPJ93K1
Seiko Prospex Great Blue Turtle Scuba PADI Special Edition SRPK01K1

Seiko Prospex ‘Great Blue’ Scuba PADI Samurai SRPJ93K1 and Turtle SRPK01K1

As there are three different models on display here, there are three different calibres too. It’s the 4R36 for the Turtle, 4R35 for the Samurai and 6R35 for the Sumo. The Samurai has the lowest power reserve at 40-hours while the Sumo has the highest specs at 70-hours. That’s quite a big difference in mechanical performance, which is reflected in the prices.

Seiko Prospex Great Blue Sumo Scuba PADI Special Edition SPB375J1

The ‘Great Blue’ Samurai Scuba is £550, the Great Blue Turtle Scuba is £570 and the Great Blue Sumo Scuba is £1,100. Of the trio, my favourite is the Turtle, although that’s likely because I was already a Turtle fan, and this launch hasn’t changed that. It’s simply another cool variant, and one that helps to fund positive global change, which is always a bonus.

Price & Specs:

  • Model: Seiko Prospex ‘Great Blue’ Samurai, Turtle, Sumo Scuba PADI Special Edition
  • Ref: SRPJ93K1 (Samurai),  SRPK01K1 (Turtle), SPB375J1 (Sumo)
  • Case/dial: 43.8mm diameter x 12.8mm thickness (Samurai), 45mm diameter x 13.22mm thickness (Turtle), 45mm diameter x 13.35mm thickness (Sumo), blue dial
  • Water resistance: 200m (20 bar)
  • Movement: Seiko calibre 4R35 (Samurai), 4R36 (Turtle), 6R35 (Sumo), automatic
  • Frequency: 21,600 (3 Hz)
  • Power reserve: 41h (Samurai and Turtle) or 70h (Sumo)
  • Functions: Hours, minutes, seconds, date
  • Strap: Silicone rubber (Samurai) or stainless steel bracelet (Turtle and Sumo)
  • Price/availability: £550 (Samurai), £570 (Turtle), £1,100 (Sumo), available in July 2023


Leave a reply
  • How do I know when the new great blue are available for purchase interested in the sumo and the Australian price please let me know Chris

  • Hi
    The case of the product is very stylish, I agree with my friends on this issue.
    But the case diameter is small for such a model. It should have been at least 48 to 50mm.
    have a nice day.

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About the author

Michael Sonsino

As Digital Editor for Oracle Time, Michael needs an eye for detail, which makes it a good thing that his twin joys in life are miniatures and watches. He's a lifelong fan of fine timepieces, especially those of a more historic nature - if it has a twist of Art Deco, all the better. Recent purchase: Seiko Prospex 1959 Alpinist Modern Re-Interpretation. Grail watch: Vacheron Constantin Historiques American 1921.