Seiko Prospex 4R Compact Mechanical Diver’s Cobalt Blue 42mm Watch SRPL51K1

The Seiko Prospex SRPL51K1 is a refined evolution of Seiko’s celebrated Samurai diver heritage. Designed with angular aesthetics and Japanese precision, this compact diver blends bold style with everyday wearability. The 41.7 mm stainless steel case, measuring just 12.3 mm thick and ~49.5 mm lug-to-lug, offers a comfortable fit while delivering standout wrist presence. The gleaming cobalt-blue dial captures light beautifully, encircled by a unidirectional bezel and protected by scratch‑resistant Hardlex crystal with rich lume on the hands, dial, and bezel for excellent underwater visibility. The movement inside is Seiko’s durable 4R35 automatic caliber, featuring manual winding, hacking seconds, and a 41-hour power reserve. Equipped for serious adventure, this diver is ISO-compliant with 200 m water resistance, a screw-down crown & caseback, and a three-fold clasp with safety and extender for a secure fit.

UK Orders (Jewellery)

Orders under £80 will be subject to a delivery charge of £3.99 and will be sent on Royal Mail Tracked 24 for service.

Orders of £80 and over will be sent free of charge and will be sent on Royal Mail Tracked 24 for service.

For orders above £150 we will use Royal Mail Special Delivery which is guaranteed to arrive the next (working) day after the day of despatch.

International Orders (Jewellery)

European and International orders will be charged at £9.99 and sent by Royal Mail International Tracked service.

For more information, see our order delivery page.

UK Orders (Watches)

Orders as standard will be sent on Royal Mail Tracked 24 for service with a cost of £4.99.

International Orders (Watches)

European and International orders will be charged at £10.99 and sent by Royal Mail International Tracked service.

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