CITIZEN NK0030-51E TSUYOSA MECHANICAL UNISEX WATCH

The Citizen NK0030-51E is the black-dial edition of the Tsuyosa 60 — Citizen's upgraded integrated-bracelet automatic, in a compact 37mm case. The dial is finely machined with a guilloché texture and sunray finish, so light travels outward from the centre as the wrist turns, lifting the dial from near-solid black in shadow to a soft charcoal sheen in daylight.

Black is the restrained choice here, and deliberately so. Guilloché texture can become visually busy against a bright dial — against black it stays controlled, so you notice the pattern when light catches it rather than from across the room. It's a dial that photographs as plain black and reveals itself in person.

Inside is the in-house Calibre 8310 with a 60-hour power reserve, hacking seconds and hand-winding — visible through the exhibition caseback. An anti-reflective sapphire crystal covers a magnified date window at 3 o'clock, and the seamlessly integrated five-link bracelet flows straight out of the case with no visible lugs, closing on a fold-over clasp with push buttons. Water resistant to 50 metres.

At a Glance

• BrandCitizen
• CollectionTsuyosa 60
• MovementCalibre 8310 Automatic
• Power Reserve60 Hours
• Case Size37mm
• Thickness11.5mm
• DialBlack, Sunray Guilloché
• GlassSapphire, Anti-Reflective
• DateMagnified, 3 O'Clock
• CasebackExhibition
• BraceletIntegrated Five-Link
• Water Resistance50m

Why You'll Love It

• The new Calibre 8310 delivers a 60-hour power reserve — half again as long as the previous generation's 40 hours, so it comfortably survives a weekend off the wrist without stopping.
• The black sunray guilloché dial is the sleeper feature: it reads as plain black in photographs and reveals its machined texture in person, shifting from near-solid black in shadow to a soft charcoal sheen in daylight.
• Black keeps the guilloché pattern controlled. On a bright dial the texture can become busy — here it stays restrained, showing itself when light catches the surface rather than announcing itself from across the room.
• Hacking seconds lets you stop the seconds hand to set the time precisely, and hand-winding means you can top up the reserve directly rather than waiting for wrist motion.
• At 37mm and 11.5mm thin, this is one of the few genuinely compact integrated-bracelet watches available — most of the category arrives oversized, and most Tsuyosa references sit at 40mm.
• The five-link bracelet is seamlessly integrated with no visible lugs, flowing straight out of the case — the detail that makes this design language work.
• Anti-reflective sapphire crystal offers scratch resistance mineral glass can't match, with a magnified date window for genuine legibility.
• Nothing was given up to make it smaller — same sapphire crystal, same 60-hour automatic movement, same seamless bracelet as the 40mm version.

Perfect For

• Mechanical Watch Enthusiasts
• Integrated Bracelet Fans
• Smaller Wrists & Compact Sizing
• Understated Everyday Style
• Office & Smart-Casual
• First Automatic Watch
• 1970s Sport-Luxury Design

Key Features

• Calibre 8310 in-house automatic — 60-hour power reserve, hacking seconds, and hand-winding capability.
• Black sunray guilloché dial — finely machined, with light radiating outward from the centre.
• Applied metal indices — sharp, catching the same light as the dial texture.
• Magnified date window — at 3 o'clock.
• Anti-reflective sapphire crystal — scratch resistance beyond what mineral glass offers.
• Exhibition caseback — displaying the Calibre 8310 movement.
• 37mm silver-tone stainless steel case — 11.5mm thin.
• Seamlessly integrated five-link bracelet — no visible lugs, fold-over clasp with push buttons.
• 50-metre water resistance (5 BAR) — rated for handwashing, rain and brief splashes.

Technical Specifications

The Citizen NK0030-51E is a 37mm automatic watch from the Tsuyosa 60 generation, powered by the in-house Calibre 8310 with a 60-hour power reserve, hacking seconds and hand-winding. The silver-tone stainless steel case measures 11.5mm thick with an anti-reflective sapphire crystal, a magnified date window at 3 o'clock and an exhibition caseback, water resistant to 50 metres. The finely machined black sunray guilloché dial carries applied metal indices. It's finished on a seamlessly integrated five-link stainless steel bracelet with a fold-over clasp and push buttons.

Best Matched With

• Charcoal Suit
• White Oxford Shirt
• Navy Blazer
• Grey Wool Trousers
• Smart-Casual Chinos
• Monochrome Styling

Frequently Asked Questions

Why Buy from City Chain Singapore

• Authorised Retailer 100% genuine Citizen product
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