Every current Seiko with a US list price under $500, ranked on published specs. Most are Seiko 5 Sports automatics, so the differences come down to size, water resistance and complications.
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How we picked
Each watch earns points from published specs only: sapphire crystal (2), water resistance of 200 m or ISO 6425 diver certification (2; 100 m earns 1), screw-down crown (1), power reserve of 70 hours or more (1), display caseback (0.5), hacking plus hand-winding (0.5) and lug-to-lug of 47 mm or less (0.5). We rank by points, then by lower US list price. Near-identical colourways are grouped and we show the lowest-priced one. We cap each model family at two picks so the list isn't one watch in six colours.
The Seiko SRPE57 is a sports watch from the Seiko 5 Sports collection, part of the SKX series family. It has a 40 mm stainless steel case, 11.5 mm thick, 44.6 mm from lug to lug. Inside is an automatic movement (calibre 4R36) with 41 h of power reserve. You also get 100 m water resistance, a hardlex (mineral) crystal and a bracelet.
Good for: Wrists of roughly 16.0–17.9 cm (6.3–7.0 in), by our Watch Finder sizing guide; Everyday wear including swimming; People who enjoy seeing a mechanical movement at work.
Why it's here
Compact 44.6 mm lug-to-lug suits smaller wrists
Display caseback shows the movement
Hacks and hand-winds, so it is easy to set
Trade-offs
Hardlex (mineral) crystal scratches more easily than sapphire
41 h power reserve: it stops after about a day and a half off the wrist
Full specs and fit checkCheck price on AmazonUS list price $315 (US list) (brand site, checked 29 Oct 2026). Amazon prices change often, so we don't show them here. Check the seller and warranty before you buy. Amazon links are paid links.
The Seiko SRPJ81 is a sports watch from the Seiko 5 Sports collection, part of the Field series family. It has a 36.4 mm stainless steel case, 12.5 mm thick, 44.4 mm from lug to lug. Inside is an automatic movement (calibre 4R36) with 41 h of power reserve. You also get 100 m water resistance, a hardlex (mineral) crystal and a bracelet.
Good for: Wrists of roughly 15.0–16.3 cm (5.9–6.4 in), by our Watch Finder sizing guide; Everyday wear including swimming; People who enjoy seeing a mechanical movement at work.
Why it's here
Compact 44.4 mm lug-to-lug suits smaller wrists
Display caseback shows the movement
Hacks and hand-winds, so it is easy to set
Trade-offs
Hardlex (mineral) crystal scratches more easily than sapphire
41 h power reserve: it stops after about a day and a half off the wrist
Full specs and fit checkCheck price on AmazonUS list price $315 (US list) (brand site, checked 29 Oct 2026). Amazon prices change often, so we don't show them here. Check the seller and warranty before you buy. Amazon links are paid links.
The Seiko SRPD51 is a sports watch from the Seiko 5 Sports collection, part of the SKX series family. It has a 42.5 mm stainless steel case, 13.4 mm thick, 46 mm from lug to lug. Inside is an automatic movement (calibre 4R36) with 41 h of power reserve. You also get 100 m water resistance, a hardlex (mineral) crystal and a bracelet.
Good for: Wrists of roughly 17.0–18.9 cm (6.7–7.5 in), by our Watch Finder sizing guide; Everyday wear including swimming; People who enjoy seeing a mechanical movement at work.
Why it's here
Compact 46 mm lug-to-lug suits smaller wrists
Display caseback shows the movement
Hacks and hand-winds, so it is easy to set
Trade-offs
Hardlex (mineral) crystal scratches more easily than sapphire
41 h power reserve: it stops after about a day and a half off the wrist
Full specs and fit checkCheck price on AmazonUS list price $350 (US list) (brand site, checked 29 Oct 2026). Amazon prices change often, so we don't show them here. Check the seller and warranty before you buy. Amazon links are paid links.
The Seiko SRPD55 is a diver watch from the Seiko 5 Sports collection. It has a 42.5 mm stainless steel case, 13.4 mm thick, 46 mm from lug to lug. Inside is an automatic movement (calibre 4R36) with 41 h of power reserve. You also get 100 m water resistance, a hardlex (mineral) crystal and a bracelet.
Good for: Wrists of roughly 17.0–18.9 cm (6.7–7.5 in), by our Watch Finder sizing guide; Everyday wear including swimming; People who enjoy seeing a mechanical movement at work.
Why it's here
Compact 46 mm lug-to-lug suits smaller wrists
Display caseback shows the movement
Hacks and hand-winds, so it is easy to set
Trade-offs
Hardlex (mineral) crystal scratches more easily than sapphire
41 h power reserve: it stops after about a day and a half off the wrist
Full specs and fit checkCheck price on AmazonUS list price $350 (US list) (brand site, checked 29 Oct 2026). Amazon prices change often, so we don't show them here. Check the seller and warranty before you buy. Amazon links are paid links.
The Seiko SRPK87 is a sports watch from the Seiko 5 Sports collection, part of the SNXS series family. It has a 37.4 mm stainless steel case, 12.5 mm thick, 44.7 mm from lug to lug. Inside is an automatic movement (calibre 4R36) with 41 h of power reserve. You also get 100 m water resistance, a hardlex (mineral) crystal and a bracelet.
Good for: Wrists of roughly 15.1–16.8 cm (5.9–6.6 in), by our Watch Finder sizing guide; Everyday wear including swimming; People who enjoy seeing a mechanical movement at work.
Why it's here
Compact 44.7 mm lug-to-lug suits smaller wrists
Display caseback shows the movement
Hacks and hand-winds, so it is easy to set
Trade-offs
Hardlex (mineral) crystal scratches more easily than sapphire
41 h power reserve: it stops after about a day and a half off the wrist
Full specs and fit checkCheck price on AmazonUS list price $415 (US list) (brand site, checked 29 Oct 2026). Amazon prices change often, so we don't show them here. Check the seller and warranty before you buy. Amazon links are paid links.
The Seiko SRPG27 is a sports watch from the Seiko 5 Sports collection, part of the Field series family. It has a 39.4 mm stainless steel case, 13.2 mm thick, 48.1 mm from lug to lug. Inside is an automatic movement (calibre 4R36) with 41 h of power reserve. You also get 100 m water resistance, a hardlex (mineral) crystal and a bracelet.
Good for: Wrists of roughly 16.2–17.6 cm (6.4–6.9 in), by our Watch Finder sizing guide; Everyday wear including swimming; People who enjoy seeing a mechanical movement at work.
Why it's here
Display caseback shows the movement
Hacks and hand-winds, so it is easy to set
Trade-offs
Hardlex (mineral) crystal scratches more easily than sapphire
41 h power reserve: it stops after about a day and a half off the wrist
Full specs and fit checkCheck price on AmazonUS list price $315 (US list) (brand site, checked 29 Oct 2026). Amazon prices change often, so we don't show them here. Check the seller and warranty before you buy. Amazon links are paid links.
The Seiko SRE021 is a sports watch from the Seiko 5 Sports collection, part of the SNXS series family. It has a 32 mm stainless steel case, 11.4 mm thick, 38.7 mm from lug to lug. Inside is an automatic movement (calibre 2R06) with 40 h of power reserve. You also get 100 m water resistance, a hardlex (mineral) crystal and a bracelet.
Good for: Wrists of roughly 13.0–14.5 cm (5.1–5.7 in), by our Watch Finder sizing guide; Everyday wear including swimming.
Why it's here
Compact 38.7 mm lug-to-lug suits smaller wrists
Hacks and hand-winds, so it is easy to set
Trade-offs
Hardlex (mineral) crystal scratches more easily than sapphire
40 h power reserve: it stops after about a day and a half off the wrist
Full specs and fit checkCheck price on AmazonUS list price $385 (US list) (brand site, checked 23 Oct 2026). Amazon prices change often, so we don't show them here. Check the seller and warranty before you buy. Amazon links are paid links.
Questions
Which is the cheapest watch in this guide?
The Seiko SRPE57, at a US list price of $315 when we checked.
How did you choose these watches?
We ranked them on published specs only, using the scoring rules on this page. We haven't reviewed or worn these watches for this guide, and no brand or retailer paid to be included.
Which of these can I swim with?
Seiko SRPE57, Seiko SRPJ81, Seiko SRPD51, Seiko SRPD55, Seiko SRPK87, Seiko SRPG27 are rated to 100 m or more.
Do you earn money from these links?
Amazon links are paid links: as an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Links to brand sites and eBay are not affiliate links.
