Seiko 5 Sports SRPD63K1 review
A green automatic diver-style watch at a fair price.
- Skip it if
- You want time to the second
as of 6 Nov 2026, 13:25 GMT · Details
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Researched, not used. We haven't used this product. This review is built from the maker's details and what other buyers report.
What we like
- Green dial and bezel with strong colour
- 4R36 movement that can be hand-wound
- See-through caseback on a steel bracelet
Worth knowing
- Ordinary automatic accuracy
- 100 m rating is not diver-grade
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Our review
The SRPD63K1 is the green-dial, green-bezel Seiko 5 Sports automatic on a steel bracelet. It uses Seiko's 4R36 movement, which can be hand-wound, and has a see-through caseback. It is a sturdy and popular first mechanical watch with a strong colour. The catches are ordinary automatic accuracy and a 100 m rating that is not diver-grade.
What it is
The SRPD63K1 is the green version of Seiko's modern 5 Sports diver-style automatic. It shares its case, movement and bracelet with the black and blue models and differs in its dial and bezel colour. It sits at the entry level of Seiko's mechanical watches, below the Prospex range, and is a popular first automatic.
Green dials have been a recent fashion, and the finish on this watch makes the colour change with the light from dark forest to something lighter.
The movement
It uses Seiko's 4R36 automatic with a reserve of about 41 hours, hand-winding and a seconds-stop for setting. Seiko's own accuracy range is wide, so typical results are a few seconds a day gained or lost, with some variation between examples. Plan on a service every several years. A caseback window lets you see the rotor and movement.
The 4R36 is a durable, widely serviced movement, and a competent watchmaker can regulate it if it runs fast or slow.
On the wrist
The case is about 42.5 mm across and fairly thick, so it is a medium-large watch that suits most wrists. The day and date window sits at 3. The steel bracelet is 22 mm wide and fairly robust, although the clasp is basic and the sizing is by pins. If you have a small wrist, check the lug-to-lug figure on the listing. A leather or rubber strap in the same width can change the character.
The green dial with a matching bezel can look quite bold in sunlight, and the finish works well with khaki and denim.
Water and everyday wear
The 100 m rating suits swimming and snorkelling but is not an ISO dive rating. The crystal is Hardlex, Seiko's tougher mineral glass, which will scratch more readily than sapphire. The hands and markers have lume. Do not operate the crown underwater.
The bezel suits a casual sports watch rather than a dive tool, and the lume needs light to charge before it glows.
Against the alternatives
The Seiko 5 Sports SRPD55K1 is the black version and the Seiko 5 Sports SRPD51K1 the blue. The Orient Kamasu RA-AA0004E19B is a green automatic diver with a sapphire crystal and a 200 m rating. The Orient Mako 40 RA-AC0Q10N30B is another Japanese diver-style automatic. For a Swiss alternative, the Tissot PRX Powermatic 80 T137.407.11.041.00 offers a longer reserve.
Who it's for, and who should skip it
It suits people who want a colourful, hard-wearing first automatic with a mechanical movement they can see. Skip it if you want sapphire glass, accuracy to the second, or a slim case.
It is a solid, characterful choice but not a refined one, and quartz or solar watches will keep better time for less upkeep.
A researched review, built from the maker's specs, manual and Amazon.co.uk listing; facts checked 6 Nov 2026.
Who shouldn't buy this
Don't buy it if you want time to the second: an automatic gains or loses a few seconds a day and needs a service every few years.
Key specs
| Movement | automatic |
| Calibre | 4R36 |
| Case | 42.5 mm |
| Thickness | 13.4 mm |
| Lug width | 22 mm |
| Water resistance | 100 m |
| Crystal | Hardlex (mineral) |
| Strap | bracelet |
| Power reserve | 41 h |
| Accuracy | +45 to -35 s/day |
This is a Researched review: we haven't used this product. We check the maker's details against at least two independent sources, re-check the price where we can track it automatically, and say plainly who it isn't for. Commissions never change a rating.
If this isn’t the one
as of 6 Nov 2026, 13:25 GMT · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.
as of 6 Nov 2026, 13:25 GMT · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.