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“Seiko Speedtimer” covers several watches, not one shared movement or set of specifications. The SSC813 and SSC911 are solar chronographs; other Speedtimer references include automatic mechanical watches and mechanical chronographs. Check the reference number before comparing size, charge, water resistance, or strap fit.
What is a Seiko Speedtimer?
Seiko’s Speedtimer history traces the name to the 1969 Speedtimer with Caliber 6139, which Seiko describes as the first automatic chronograph with a column wheel and vertical clutch. Today, Prospex Speedtimer includes several distinct branches, so the collection name alone does not tell you how a watch is powered or what its timer does. Seiko’s Speedtimer collection and individual product pages identify the reference-specific differences.
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What are the SSC813’s main specifications?
The SSC813 is a solar chronograph powered by Seiko Caliber V192. Seiko lists a 39.0 mm case diameter, 45.5 mm lug-to-lug length, 13.3 mm thickness, 20 mm lug width, and 161 g weight. It has a curved sapphire crystal with inner anti-reflective coating and a 10 bar water-resistance rating. Its chronograph measures up to 60 minutes in 1/5-second increments; the dial also includes a date, 24-hour hand, power-reserve indicator, and tachymeter. Seiko specifies accuracy of ±15 seconds per month and approximately six months of operation on a full charge. See the SSC813 specifications.
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Both are V192 solar chronographs with a curved sapphire crystal, 10 bar water resistance, a 60-minute chronograph in 1/5-second increments, and approximately six months of operation when fully charged. Their most useful practical differences are case size and strap width.
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| Reference | Diameter | Lug-to-lug | Thickness | Lug width | Water resistance |
|---|---|---|---|---|---|
| SSC813 | 39.0 mm | 45.5 mm | 13.3 mm | 20 mm | 10 bar |
| SSC911 | 41.4 mm | 45.9 mm | Not stated on the cited product page; see Seiko’s SSC911 specifications. | 21 mm | 10 bar |
The SSC813 is the narrower option and takes a 20 mm strap; the SSC911 is wider and takes a 21 mm strap. Confirm the measurements on the exact regional product page before buying an accessory.
Why is my Speedtimer power-reserve hand only half full?
A partly filled power-reserve indication does not by itself establish that the watch is faulty. The V192 stores electrical energy generated by light, and its charge depends on exposure. Seiko’s solar-watch guidance recommends regular exposure to bright light and cautions against prolonged charging at high temperatures. For the indicator’s meaning and correct hand-position or button procedures, follow the V192 caliber manual for your watch rather than relying on an owner’s anecdote.
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Seiko says a second hand that advances in two- or five-second intervals indicates an extremely low charge and that the watch should be recharged. If proper charging and the manual’s troubleshooting steps do not resolve abnormal behavior, contact Seiko service support.
How long does the solar charge last, and how should I charge it?
For the SSC813 and SSC911, Seiko specifies approximately six months of operation when fully charged. This is the stated operating duration from a full charge, not a promise that any particular number of hours in sunlight will fully charge the watch. Seiko explains that solar cells beneath the dial convert light into electrical energy stored in a rechargeable battery; regular bright-light exposure helps maintain the charge. Avoid prolonged high-temperature charging and use the V192 manual for charging guidance specific to light conditions.
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What does the chronograph measure, and what is the tachymeter for?
On the SSC813 and SSC911, the chronograph records elapsed time up to 60 minutes in 1/5-second increments. The tachymeter scale can help estimate speed over a known distance when used with elapsed time. Seiko’s V192 manual has separate stopwatch and tachymeter instructions; use it for the exact control sequence.
Are Speedtimers automatic or solar?
Both types exist, and their functions differ by reference. The SSC813 and SSC911 use the solar V192 chronograph movement. The SPB513 and SPB515 are automatic mechanical watches with Caliber 6R55 and a countdown-timer function operated by a crown at 4 o’clock. Seiko’s 2025 launch material lists 39.5 mm diameter, 12.0 mm thickness, a 72-hour power reserve, and 20 bar water resistance for those models. The SRQ055 is a separate automatic mechanical chronograph using Caliber 8R48, with a column wheel and vertical clutch, 30-minute and 12-hour counters, and a stated 45-hour reserve; Seiko’s 2025 material lists a 42 mm diameter and 14.6 mm thickness. Check the relevant regional product page for the exact reference and current availability.
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Is a Speedtimer water-resistant enough for swimming?
Seiko rates the SSC813 and SSC911 at 10 bar, while its 2025 material lists 20 bar for the SPB513 and SPB515. These ratings are model-specific; do not apply one reference’s rating to the Speedtimer family as a whole. Consult Seiko’s water-resistance and handling guidance for activity-specific advice, particularly if the watch is older, damaged, or has been serviced.
Which replacement strap fits my reference?
Match the strap’s width to the exact watch: the SSC813 has a 20 mm lug width, while the SSC911 has a 21 mm lug width. A strap of the right width may still differ in end shape or fit, so check its compatibility with the case and bracelet or strap attachment before ordering. Do not assume a strap that fits one Speedtimer will fit another.
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What should I compare before choosing a Speedtimer?
- Movement and upkeep: Decide whether you want a solar watch or an automatic mechanical watch, and compare the relevant model’s maintenance expectations.
- Function: Distinguish an elapsed-time chronograph from the countdown timer on the SPB513/SPB515.
- Fit: Compare diameter, lug-to-lug length, thickness, and lug width—not diameter alone.
- Use: Check the water-resistance rating for the exact reference and your intended activities.
- Price and availability: Check Seiko’s regional product page and local retailers; prices and availability vary by market and date. Seiko’s 2022 US announcement listed launch recommended prices of $700 for SSC915 and $750 for SSC911/SSC913, but those historical figures are not current universal pricing.
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 at the time of purchase will apply.
