Methodology

1. What our data is

Three sources, in this order of preference:

• ·Manufacturer documentation.Seiko’s own product specification pages, instruction manuals and caliber documentation. Case dimensions, lug-to-lug, thickness, lug width, crystal material, movement specification, beat rate, jewel count, power reserve and stated accuracy all come from here.
• ·Published standards.ISO 6425 for divers’ watches and ISO 22810 for general water resistance. When we write “200 m, ISO 6425 rated,” that references a specific set of tests, and we list them.
• ·Live retailer pricing. Amazon, via its product data API, refreshed on a schedule. Used for price and availability only — never for specifications.

2. What our data is not

We do not copy specifications from other watch sites. That propagates their errors and adds nothing — it is how one wrong lug-to-lug figure ends up on nine pages that all cite each other.

We do not estimate figures the manufacturer does not publish.Seiko is inconsistent about lug-to-lug: it publishes the figure reliably for the Prospex and 5 Sports lines and not at all for several older references. Where it is missing, our spec tables say “Not published by Seiko” rather than carrying a number we invented. That is a real limitation of these pages and it is better than the alternative.

We make no claim that requires touching the watch.No measured accuracy figures. No lume duration timings. No comfort or wearability judgments. No “in our experience.” That rules out a lot of sentences these pages could otherwise contain, and it is the constraint that makes the rest of them worth reading.

3. How picks are selected

The criteria below are applied in this order. Where two watches are close, the earlier criterion decides.

• ·Specification completeness at the price. What the watch actually includes — crystal material, water rating, movement features — measured against what else is available at that money.
• ·Movement relative to the bracket. Whether the caliber is appropriate to the price. A 7S26 at $150 is good value; the same movement at $350 is not.
• ·Case proportions against typical wrists. Ranked on lug-to-lug and thickness rather than diameter, because those are the figures that determine fit.
• ·Strap and bracelet flexibility. Lug width and how deep the aftermarket is for it — a real factor in how much use a watch gets.
• ·Availability. Current production and in stock beats discontinued and scarce, because a recommendation you cannot act on is not a recommendation.

The score on each pick is the mean of those criteria, to one decimal place. It is a judgment compiled from published documentation, not a measurement, and it appears as visible page content only — never as review or rating markup in our structured data, because marking an editorial score up as a product review rating would contradict everything on this page.

4. Every pick carries a “skip this”

Not a hedge — an actual statement of who should not buy the watch and why. It is the part of a roundup that a page with something to hide never writes, and it is the fastest way for you to tell whether a recommendation was thought about. If a pick’s skip-this does not apply to you, that is a much stronger signal than the score.

5. How prices work

Prices come from Amazon’s product data API and are refreshed on a schedule. Every price on this site carries the date it was verified — currently Jul 24, 2026.

There is a hard gate in the code: any price older than 48 hours is not displayed at all. The button falls back to “Check price” and no number appears. We would rather show you nothing than a figure that has rotted, and the gate is deliberately automatic so nobody has to remember to enforce it.

We never hardcode a price into a page. If you see a number on this site, it came from the live data layer within the last 48 hours.

6. How we handle JDM versus international

Market variance is disclosed per reference rather than glossed over. Where a watch is Japan-market only, its spec table says so and its entry carries the warranty caveat. Where a claim about J-suffix versus K-suffix references is widely repeated but not supported by Seiko’s documentation — the regulation claim, specifically — we say that we could not verify it rather than repeating it as fact.

7. What would change a pick

• ·A price move that changes the value argument in its bracket
• ·A new reference that does the same job better at the same money
• ·Discontinuation — a pick you cannot buy is replaced, not left
• ·A specification correction from manufacturer documentation

Commercial pages are reviewed every 90 days. New releases are folded into relevant roundups within 30 days. Specifications are re-verified annually against current manufacturer documentation. The last-updated date on a page reflects a real content change — we do not churn dates to fake freshness.

8. Corrections

If a figure here is wrong, tell us and we will fix it. Email info@springanddial.com with the reference number, the figure you believe is wrong, and where the correct one is published. Material corrections are made on the page and dated — the policy is here.

9. Money

This site earns a commission on qualifying purchases made through its links, and it is funded entirely that way. As an Amazon Associate we earn from qualifying purchases.

Commission does not influence ranking or selection. That is easy to claim and hard to prove, so here is the check you can actually run: every criterion in section 3 is a published specification, and every pick carries a stated reason to skip it. If a page ranked a watch above a better-specified cheaper one, the spec tables on that same page would show it.

Money links route through a /go redirect so a merchant can be changed without rewriting content. Those links carry rel="sponsored nofollow", are excluded from our sitemap, and are disallowed to crawlers. The full disclosure is here.