Samurai SRPL13 Seiko's angular diver slims down to 41.7 mm

What is new about the Prospex Samurai SRPL13?

The Samurai has been part of Seiko's diver range since 2004, and for most of that time it has been a big watch. The previous generation measured 43.8 mm across. In June 2024 Seiko announced a redesigned Samurai family with three references: the SRPL11 with a burgundy dial and bezel, the SRPL13 in black on a steel bracelet, and the SRPL15 with a black coated case on a silicone strap. This first look covers the SRPL13, the plainest of the three.

Monochrome Watches described it as an almost entirely new design apart from the movement. The diameter drops to 41.7 mm, the lugs are slimmer and more tapered, and the case looks less bulky from every angle. The bezel keeps its knurled edge but gets a sleeker insert, the markers and hands are new, and the date moves to 4:30. Seiko UK lists the SRPL13 at £580.

How big is it, and how will it wear?

Seiko quotes 41.7 mm across, 12.3 mm thick and 49.5 mm from lug to lug, with 20 mm between the lugs and a weight of 170 g on the bracelet. Monochrome called the lug to lug figure a tad long, but said the lug shape and the case back help it sit well. Dappered's reviewer found it surprisingly wearable for a tool diver, and Teddy Baldassarre's reviewer went further, saying it wears smaller than its numbers suggest.

For context, the outgoing Samurai was 13.4 mm thick according to Teddy Baldassarre, so the new case is both narrower and slimmer. On a wrist around 16 cm to 18 cm it should feel like a mid-size diver rather than a statement piece. The angular case is still the point of the watch, and it will not suit people who prefer softer, rounder shapes.

What movement does it use, and how accurate is it?

The SRPL13 uses Seiko's calibre 4R35, an automatic movement with manual winding, hacking seconds, 23 jewels and a beat rate of 21,600 vibrations per hour. Seiko quotes a power reserve of approximately 41 hours. Monochrome gives the official accuracy as -35 to +45 seconds per day, which is a loose tolerance by modern standards.

In practice the figures reported by reviewers are much better than the tolerance. Teddy Baldassarre published rate checks of +2 to +9 seconds per day for an SRPL13, and similar results for the other two references. That is one sample, so treat it as a sign of what is possible rather than a promise. Dappered noted that the rotor is quiet and that hand winding through the crown feels smooth.

How well is it built?

The case is brushed stainless steel with a screw-down crown and a solid screwed case back. Seiko rates it as a 200 m diver's watch and lists magnetic resistance of 4,800 A/m. The bezel is unidirectional with 120 clicks, and Seiko applies LumiBrite to the hands, the hour markers and the bezel.

The bracelet is a three-link steel design with a three-fold clasp, a secure lock, a push-button release and a diver's extension. Teddy Baldassarre says it tapers from 20 mm at the case to about 17.5 mm at the clasp and praises the end links, but calls the stamped clasp underwhelming. Dappered points out there are no quick-release pins and no on-the-fly micro-adjustment, though the drilled lugs make strap changes easy.

The crystal is Hardlex, Seiko's own hardened mineral glass. It is tough and clear, but it will scratch more readily than sapphire.

Is it good value against its rivals?

At £580 the SRPL13 sits near the top of the £300 to £600 band, and that is where the comparison gets harder. The Orient Kamasu RA-AA0825S has an RRP of £424.99 and pairs an automatic movement and 200 m water resistance with a sapphire crystal. Citizen's Promaster Dive BN0261-51E costs £369 and offers a sapphire crystal, a 200 m ISO rating and a solar Eco-Drive movement that never needs winding.

Seiko's own Prospex Solar Diver's SNE595 is £500, also with sapphire. The Samurai's case for itself rests on design and on the 4R35's hacking and hand winding rather than on headline specifications. If you love the shape, those rivals will not replace it. If you are shopping by spec sheet, they offer more for less.

What is the catch?

The crystal is the obvious one. Hardlex at £580 feels behind the times when cheaper divers from Orient and Citizen, and Seiko's own solar diver, use sapphire. The second is the movement's official tolerance, which is wide even if real examples tend to run well. Teddy Baldassarre also found the small round date window at 4:30 hard to read, and the clasp feels cheaper than the rest of the watch.

None of these are deal breakers for a sturdy diver you plan to wear hard, but they are worth knowing before paying the full RRP. The redesign solved the Samurai's size problem. It did not touch the parts list.

“The redesign solved the Samurai's size problem. It did not touch the parts list.”

What do owners say?

Themes from public owner feedback, paraphrased. We never copy Amazon reviews or ratings.

• Reviewers say the slimmer case and tapered lugs make it wear smaller than its 41.7 mm figure suggests

  Teddy Baldassarre (opens in a new tab)

• The stamped clasp and lack of quick-release pins or on-the-fly adjustment feel below the watch's price

  Dappered (opens in a new tab)

• The Hardlex crystal divides opinion: clear and low distortion, but many buyers want sapphire

  Teddy Baldassarre (opens in a new tab)