Citizen Tsuyosa vs Seiko 5 Sports
Citizen Tsuyosa NJ0150-56A vs Seiko SRPE57, compared on the specs each brand publishes.
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The short answer
Two affordable Japanese automatics, compared on Citizen's and Seiko's specs.
- Water resistance: the Seiko SRPE57 is 50 m more (100 m vs 50 m).
- Price: the Seiko SRPE57 lists for $180 less in the US ($315 vs $495).
- Calibre: Citizen Tsuyosa NJ0150-56A has 8210; Seiko SRPE57 has 4R36.
- Crystal: Citizen Tsuyosa NJ0150-56A has Sapphire; Seiko SRPE57 has Hardlex (mineral).
- Lug width: Citizen Tsuyosa NJ0150-56A has 9.1 mm; Seiko SRPE57 has 20 mm.
Side-by-side specs
| Spec | Citizen Tsuyosa NJ0150-56A | Seiko SRPE57 |
|---|---|---|
| Case diameter | 40 mm | 40 mm |
| Thickness | Not published by Citizen | 11.5 mm |
| Lug-to-lug | Not published by Citizen | 44.6 mm |
| Lug width | 9.1 mm | 20 mm |
| Calibre | 8210 | 4R36 |
| Movement | Automatic | Automatic |
| Power reserve | Not published by Citizen | 41 h |
| Hacking seconds | Not stated | Yes |
| Water resistance | 50 m | 100 m |
| Crystal | Sapphire | Hardlex (mineral) |
| Case material | Stainless steel | Stainless steel |
| Ships on | Bracelet | Bracelet |
| Weight | Not published by Citizen | 142 g |
| US list price | $495 (US list) | $315 (US list) |
| Dial | White | Not stated |
| Status | In production | In production |
| Suits wrists of about our sizing guide | 16.0–17.9 cm | 16.0–17.9 cm |
Specs summarised in our own words from the brand's product pages: NJ0150-56A source (checked 3 Nov 2026) SRPE57 source (checked 29 Oct 2026). "Not published" means the brand page we checked doesn't list it, so we leave it blank rather than guess.
Wrist fit
Lug-to-lug decides overhang more than diameter does. Enter your wrist to see how each one should wear.
- Citizen Tsuyosa NJ0150-56A –
- Seiko SRPE57 –
Same rule of thumb as Watch Finder: case diameter of about 23.5% of your wrist circumference (−2 mm to +2.5 mm), and lug-to-lug no longer than about 29% of it plus 1 mm. A guide, not a rule; flat or round wrists differ.
Strap fit
The Citizen Tsuyosa NJ0150-56A has 9.1 mm lugs. The Seiko SRPE57 has 20 mm lugs. A strap bought for one won't fit the other. Size charts: Citizen lug width chart · lug width chart.
Which should you buy?
It is the more compact case on paper (40 mm across). Our sizing guide puts it at about 16.0–17.9 cm.
It has the lower US list price, $315, a $180 difference.
It has the higher water-resistance rating: 100 m vs 50 m.
Prices and where to buy
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More: All Citizen Tsuyosa references · All Seiko Seiko 5 Sports references.
Questions
Which is bigger, the Citizen Tsuyosa NJ0150-56A or the Seiko SRPE57?
Per the brands, the Citizen Tsuyosa NJ0150-56A is 40 mm across and the Seiko SRPE57 is 40 mm.
Which is cheaper?
The Seiko SRPE57, at a US list price of $315 vs $495 when we checked.
Which is more water-resistant?
Citizen Tsuyosa NJ0150-56A: 50 m. Seiko SRPE57: 100 m.
Have you tested these watches?
No. This comparison uses brand-published specs and our own analysis of them, not hands-on testing.
Watch.co is independent and not affiliated with any brand. We haven't handled these watches for this page: everything here comes from brand-published specs and our own analysis. Brand names are used only to identify products.