Seiko 5 Sports SRPD55K1 review

What it is

The Seiko 5 Sports SRPD line is the modern take on the classic Seiko 5 range, in a sports case with a diver-style bezel. The SRPD55K1 is the black version on a steel bracelet. It sits at the entry level of Seiko's automatics, below the Prospex divers, and is aimed at people who want a first mechanical watch they can wear every day.

Seiko has made the 5 Sports line for decades and the SRPD generation has become a go-to recommendation for a first mechanical watch because the movement is robust and parts and service are easy to find in the UK.

The movement

The watch uses Seiko's in-house 4R36 automatic, which has a power reserve of about 41 hours, hand-winding and a seconds stop for accurate setting. The rotor winds as you move your wrist. Seiko's stated accuracy for the 4R36 is wide, and in practice many run within a few seconds a day but some need adjusting. Plan on a service every several years to keep it healthy. A caseback window shows the movement.

The 4R36 is a workhorse rather than a showpiece. It is not as finely finished or as thin as a Swiss movement, and it can be slightly noisy in the rotor, but it is built to be run for years with routine servicing.

On the wrist

The case is about 42.5 mm across and sits moderately thick, so it wears as a medium-large sports watch. The 22 mm steel bracelet is solid, though the clasp is simple and the links are not especially refined. The date and day window sits at 3. Smaller wrists may find the lug-to-lug length a stretch, so check the listing dimensions.

The bracelet has a simple push-button clasp without fine adjustment, so sizing can be fiddly; a leather or rubber strap in the same 22 mm width is an easy swap if you prefer one.

Water and everyday wear

The rating is 100 m, which allows swimming and snorkelling. It is not an ISO diver, so do not use it for scuba. The crystal is Hardlex, Seiko's tougher mineral glass, which resists knocks well but scratches more easily than sapphire. Hands and markers have lume that glows when charged. Do not operate the crown underwater.

Against the alternatives

The Seiko 5 Sports SRPD51K1 is the blue version, and the Seiko 5 Sports SRPD63K1 adds green. The Orient Kamasu RA-AA0002L19B offers a proper 200 m rating and sapphire for a bit more outlay. For a Swiss alternative, the Tissot PRX Powermatic 80 T137.407.11.041.00 has a much longer power reserve and a more refined bracelet.

Orient and Tissot are the usual rivals, and both charge more, though a Seiko 5 is the one with the biggest community of owners and straps.

Who it's for, and who should skip it

It is for anyone who wants a dependable first automatic that can take daily wear. Skip it if you want time kept to the second, sapphire glass, or a slim case. Quartz watches in the same price range will keep better time with less maintenance.