CITIZEN NK0030-51X TSUYOSA MECHANICAL UNISEX WATCH

The Citizen NK0030-51X is part of the Tsuyosa 60 generation — a genuine mechanical upgrade to Citizen's integrated-bracelet automatic collection, not just a new colourway. The headline change is the new in-house Calibre 8310, which extends the power reserve to 60 hours (up from 40) and adds both hacking seconds and hand-winding.

The dial is finished with a guilloché pattern — a decorative engine-turned texture cut into the surface. Against the soft mint green dial, the pattern reads as fine light-and-shadow relief, catching light in a way that gives the pale colour real dimension rather than looking flat. The movement is visually upgraded to match: rhodium-plated bridges, an openworked rotor, blue-coloured screws, and striped decoration on the main bridge, all visible through the exhibition caseback.

At 37mm and 11.5mm thin, this is one of the smaller and slimmer Tsuyosa options to date — most of the family sits at 40mm, so this fills a genuine gap in the lineup and wears comfortably on smaller wrists. The 5-link Jubilee-style bracelet with concealed butterfly clasp is a significant step up from the standard Tsuyosa's 3-link design. Sapphire crystal with a magnified date window, luminous hands and indices, and 50m water resistance.

At a Glance

• BrandCitizen
• CollectionTsuyosa 60
• MovementCalibre 8310 Automatic
• Power Reserve60 Hours
• Case Size37mm
• Thickness11.5mm
• Case ShapeTonneau
• DialMint Green, Guilloché Texture
• GlassSapphire, Date Magnifier
• CasebackExhibition, Decorated Movement
• Bracelet5-Link Jubilee-Style
• 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.
• 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.
• The guilloché dial texture is a genuine decorative craft — an engine-turned pattern that catches light as fine relief across the surface, giving the pale mint dial real dimension rather than a flat wash of colour.
• The movement itself is decorated to be looked at: rhodium-plated bridges, an openworked rotor, blue-coloured screws and striped bridge finishing, all on display through the exhibition caseback.
• At 37mm and 11.5mm thin, this fills a real gap in the Tsuyosa lineup — most references sit at 40mm, making this one of the few genuinely compact options, and comfortable on smaller wrists.
• The 5-link Jubilee-style bracelet with concealed butterfly clasp is a meaningful upgrade over the standard Tsuyosa's 3-link design — suppler on the wrist and cleaner in appearance.
• Sapphire crystal with a magnified date window keeps the dial protected and genuinely readable at a glance.
• The soft mint green dial is a genuinely distinctive choice — light, fresh and unusual against the polished steel case, and a clear departure from the black and white dials that dominate this category.

Perfect For

• Mechanical Watch Enthusiasts
• Integrated Bracelet Fans
• Smaller Wrists & Compact Sizing
• Mint & Pastel Dial Collectors
• Office & Smart-Casual
• First Automatic Watch
• Unisex Styling

Key Features

• Calibre 8310 in-house automatic — 60-hour power reserve, hacking seconds, and hand-winding capability.
• Guilloché-textured mint green dial — an engine-turned decorative pattern adding fine relief and depth to a soft, pale colour.
• Decorated movement — rhodium-plated bridges, openworked rotor, blue-coloured screws, striped bridge finishing.
• Exhibition caseback — displaying the decorated movement.
• 37mm tonneau-shaped stainless steel case — 11.5mm thin, one of the most compact in the Tsuyosa range.
• Sapphire crystal with magnified date window — scratch-resistant and genuinely legible.
• Applied hour markers with luminous hands and indices — clear in any light.
• 5-link Jubilee-style integrated bracelet — with concealed butterfly clasp.
• 50-metre water resistance (5 BAR) — rated for handwashing, rain and brief splashes.

Technical Specifications

The Citizen NK0030-51X 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 tonneau-shaped stainless steel case measures 11.5mm thick with sapphire crystal, a magnified date window and an exhibition caseback displaying the decorated movement, water resistant to 50 metres. The guilloché-textured mint green dial carries applied hour markers with luminous hands and indices. It's finished on an integrated 5-link Jubilee-style stainless steel bracelet with a concealed butterfly clasp.

Best Matched With

• White Linen Shirt
• Light Chinos
• Navy Blazer
• Pastel Knitwear
• Smart-Casual Summer
• Unisex Styling

Frequently Asked Questions

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