Citizen Tsuyosa Reference: The 40, the 37, the Small Second and the Shore

Verdict (spec-based)

Spec-based, not a worn review: every number on this page is copied from Citizen's own product pages and press releases, checked on 2026-08-24. We have not had these on the wrist.

Most pages about the Tsuyosa still describe one watch — the 40 mm steel automatic with the integrated bracelet that landed in 2022 and became Citizen's quiet bestseller. That page is now out of date. As of August 2026 the Tsuyosa name covers four different watches with three different water-resistance ratings and two different calibres, plus one limited collaboration. Buying "a Tsuyosa" without knowing which branch you are in is how people end up with 37 mm when they wanted 40, or 5 bar when they wanted 10.

Citizen's own gloss on the name, from its European store: "The Japanese term TSUYOSA means strength."

The four branches, side by side

Prices are Citizen's own list figures as published on its US store and global press releases, as of 2026-08-24. Street prices differ; Citizen's US store was showing a discount on the NJ0150 the day we checked.

What actually separates them

The calibre split is the important one. Three of the four branches run the calibre 8210, Citizen's mechanical workhorse: automatic with manual winding, 21 jewels, 21,600 vibrations/hour, a stop-second function, and a stated rate of −20 to +40 seconds a day. The Small Second is the exception — it runs the calibre 8322, which Citizen rates at a 60-hour power reserve, roughly half a day more than the 8210. If you take a watch off on Friday evening and want it running on Monday morning, that is the branch that does it.

The Shore models are the only ones rated to 10 bar. Every other Tsuyosa is 5 bar. Citizen introduced the Shore models in the same February 2026 announcement as the seconde/seconde/ collaboration, at 40.0 mm with a stated case thickness range of 11.7–12.5 mm across the models.

The 37 is not a shrunken 40. It is 37.0 mm and 11.5 mm thick, announced on 21 February 2025 for a spring 2025 release, with the same calibre 8210 and 5 BAR rating. Citizen positioned it for slimmer wrists rather than as a replacement.

None of them is a solar watch. This matters more than it sounds: Citizen's best-known technology is Eco-Drive, and buyers routinely assume any Citizen charges from light. The Tsuyosa does not. It is mechanical, it stops when you stop wearing it, and it needs winding or wearing to run. If you wanted the light-powered version of Citizen, read how Eco-Drive actually works first — it is a genuinely different ownership experience, not a spec-sheet detail.

The reference-suffix trap

The same watch carries different reference suffixes in different regions. Citizen's US store sells the black-dial 40 mm as NJ0150-56E; Citizen's European store sells what is recognisably the same watch as NJ0150-81E, with blue as -81L, yellow as -81Z and green as -81X. If you search a US reference on a European retailer, or the reverse, you will get no results and conclude the model is discontinued. It is not — you are searching the wrong region's suffix.

This is also why the Tsuyosa is not a Japan-only model. Citizen lists it on its own US store, so no proxy or forwarding service is needed to buy one outside Japan. (For the models that genuinely are Japan-only, see what a JDM watch is.)

Where Citizen's own numbers disagree

We found two figures that Citizen states differently on its own channels, and we are not going to paper over them:

• Power reserve. Citizen's US product page for the NJ0150 states a "42 Hour Power Reserve", and both the 2025 and 2026 global press releases state "approx. 42 hours" for the calibre 8210. Citizen's European store lists 40 hours for NJ0150-81L.
• Accuracy. The global press releases state −20 to +40 sec/day. Citizen's European store lists ±20 sec per day for the same reference.

Our reading is that the press-release figures are the manufacturer's own movement specification and the European shop listing is a simplification, but Citizen has not said so, and we are not going to assert it. Treat 40 hours and −20/+40 as the conservative planning numbers.

If you are choosing today

• You want the watch everyone means by "Tsuyosa" → the 40 mm NJ0150. 40 mm, 5 bar, sapphire, integrated steel bracelet, 138 g on Citizen's European listing.
• Your wrist is under about 16.5 cm → the 37. Same movement, 3 mm less watch. Our case-size guide covers how to check this against your own wrist rather than guessing.
• You want it to survive a weekend off the wrist → the Small Second, for the 8322's 60 hours.
• You want to swim in it → the Shore, the only branch rated 10 bar.

A note on the integrated bracelet: Citizen's European listing gives the band width as 9 mm and the US store as 9.1 mm at the case. That is an integrated fitting, not a conventional 20 mm lug — you cannot simply put a strap on it. Budget for the watch as it comes.

Where this sits in the Japanese landscape

The Tsuyosa occupies the slot that used to belong to entry-level Seiko automatics: an in-house Japanese mechanical movement, sapphire, steel, under USD 500 list. If you are cross-shopping, our Japanese watch brands guide sets out how Citizen, Seiko, Orient and Casio actually divide the ground, and mechanical vs quartz vs solar covers whether a mechanical is the right first choice at all.