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Seiko Speedtimer vs. Citizen Tsuyosa: Which Watch Suits You?

The Seiko SSC813 pairs solar power with a 60-minute chronograph; the Citizen NJ0150-56Z offers an automatic movement, date and integrated-bracelet style.
Estimate3–4 min Catalogued SpecialistWatchRanker Team
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Choose the Seiko Prospex Speedtimer SSC813 if you want a solar-powered chronograph; choose the Citizen Tsuyosa NJ0150-56Z if you want an automatic mechanical watch with a date and an integrated steel-bracelet look. The main difference is how you want the watch powered and what you want it to do—not a universal ranking of quality.

At a glance: stopwatch or automatic time-and-date?

Feature Seiko Prospex Speedtimer SSC813 Citizen Tsuyosa NJ0150-56Z
Movement Solar Caliber V192, according to Seiko Automatic Caliber 8210, according to Citizen
Functions 60-minute chronograph, 24-hour subdial and power-reserve indicator Three hands, date, hacking and a stated 42-hour power reserve
Case and crystal 39 mm case; curved sapphire glass 40 mm case, 9.1 mm lug width and sapphire crystal in Citizen’s US listing
Water information Not stated on the reviewed Seiko collection page WR50/5Bar/166ft; Citizen specifies still-water swimming
Price and warranty Comparable current price and warranty not established Citizen’s US page showed $396 sale price against $495 list and a US 5-year limited warranty when accessed in 2026; terms and price can change

Specifications are for these exact references, not every dial or regional variant. Seiko’s official collection page lists the SSC813 among its solar chronographs. The Citizen figures above refer to the US yellow-dial NJ0150-56Z listing.

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Which one should you choose?

Choose the Seiko SSC813 if you want solar power and timing

Its solar Caliber V192 powers a chronograph that measures elapsed time up to 60 minutes. It also has a 24-hour subdial and a power-reserve indicator. Choose it if stopwatch capability is useful to you, or if solar power better matches how you want to own and use a watch. Solar does not mean maintenance-free, but the movement type distinguishes it from the Citizen’s automatic mechanical movement.

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Choose the Citizen NJ0150-56Z if you want an automatic

The Tsuyosa uses Citizen’s automatic Caliber 8210 and has a three-hand display with a date. Its hacking function stops the seconds hand when setting the time, and Citizen states a 42-hour power reserve. Choose it if you specifically want a mechanical watch and value the traditional interaction of an automatic movement over a chronograph.

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How different are they on the wrist?

The listed case diameters are 39 mm for the Seiko and 40 mm for the Citizen. That one-millimeter difference alone cannot predict which will feel smaller or more comfortable. Case shape and thickness, bracelet articulation, and your wrist all affect fit; try both on if you can. Both official product pages specify sapphire crystal—Seiko describes curved sapphire glass—without establishing that either crystal is scratch-proof.

What should you know about water resistance?

Citizen lists the NJ0150-56Z as WR50/5Bar/166ft and describes use for swimming in still water. The reviewed Seiko collection page does not state a comparable water-resistance figure for the SSC813, so these sources do not support a numerical head-to-head comparison. Check the exact model specification and its manual before deciding whether either watch is suitable for a particular water activity.

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Do variant, price and warranty details change by market?

Yes. The US Citizen listing is for the yellow NJ0150-56Z and showed a $396 sale price against a $495 list price, along with a US 5-year limited warranty, when accessed in 2026. Those are regional retail terms, not guaranteed current prices or global warranty terms. Citizen’s Japanese page for the different NJ0150-56W reference describes a three-year international warranty and a domestic registration route to five years: Citizen Japan’s NJ0150-56W product page. Check the precise suffix, dial, availability and warranty for the market where you plan to buy.

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For Seiko, the cited collection page establishes the SSC813’s movement, functions, diameter and curved sapphire glass, but not a comparable current price or warranty. Confirm those details on the exact regional listing before purchase.

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Bottom line for a first watch

If your priority is an easy-to-live-with solar chronograph, the Seiko Speedtimer SSC813 is the more direct fit. If you want an automatic mechanical watch with a date and a steel-bracelet design, the Citizen Tsuyosa NJ0150-56Z fits that preference. Neither specification set establishes which watch will be more accurate in all conditions, fit every wrist better or cost less to own over time. For a first automatic specifically, the Citizen is the choice between these two.

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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.

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