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Which Speedtimer is the SSC813?
“Speedtimer Solar Chronograph” names a family, not a single case size. Seiko lists several V192-powered references, including the SSC813 and the larger SSC911. The SSC813 is the compact 39 mm interpretation discussed here; check the reference number when comparing listings or specifications so details from another model are not mistaken for SSC813 features. Seiko’s SSC813 collection page describes its size and design.
How the SSC813 looks
Seiko connects the Solar Chronograph’s styling to Speedtimer designs from the 1960s and 1970s. For the SSC813, the manufacturer calls out a sandblasted dial intended to aid readability, a 39 mm case diameter, and curved sapphire crystal. Those are documented design and dimension details; wrist fit is personal, and the available information does not establish how the watch wears on any particular wrist. Seiko’s SSC813 page
What the solar chronograph functions do
Seiko describes the V192 movement used across this solar chronograph family as providing a 60-minute chronograph, a 24-hour subdial, and a power reserve indicator displayed at the touch of a button. A chronograph measures elapsed time: start timing, stop it when the interval ends, and use the indicated elapsed-time reading. The power reserve indicator gives an indication of stored charge, while the 24-hour subdial tracks time on a 24-hour scale.
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Those are family-level descriptions. For SSC813-specific accuracy, charging, water-use guidance, and exact button operation, consult the current model page and its manual rather than extrapolating from another V192 reference.
SSC813 and SSC911: the size difference
The SSC911 is a related, larger model, not a source of specifications to transfer wholesale to the SSC813. Seiko gives the SSC813 a 39 mm diameter; its SSC911 specification page lists a 41.4 mm diameter and 45.9 mm lug-to-lug measurement. That makes the SSC911 larger on paper, but the figures alone cannot determine which will feel better on an individual wrist.
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| Reference | Documented case dimensions | What the figures establish |
|---|---|---|
| SSC813 | 39 mm diameter, per Seiko’s undated collection page | Seiko identifies it as the compact reference; the cited page does not establish thickness or lug-to-lug here. |
| SSC911 | 41.4 mm diameter and 45.9 mm lug-to-lug, per Seiko Official United States’ undated product specifications | It is larger on paper than the SSC813 by the documented diameter figures. |
Sources: Seiko SSC813 collection page and Seiko Official United States SSC911 specifications. Seiko lists SSC911’s chronograph as timing up to 60 minutes in 1/5-second increments; that precision and range are SSC911 specifications and should not be presented as independently verified SSC813 detail.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What “hands-on” evidence is available
A Little Treasury retailer-produced video published November 19, 2021 is titled as a hands-on SSC813 review. Its description frames it as the publisher’s opinion, so it can be treated as one retailer reviewer’s dated impression—not an independent test, a current assessment, or evidence that this article’s author wore the watch. Little Treasury’s 2021 SSC813 video
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