The Citizen Tsuyosa Small Second NK5010-51L is a stylish Japanese automatic watch blending contemporary design with reliable mechanical performance. Part of the new Tsuyosa series, this reference features a 40 mm stainless steel case with a subtly recessed crown at 4 o’clock, giving it a sleek and modern profile that wears easily on most wrists. The textured blue sunray-brushed dial includes a small seconds sub-dial at 6 o’clock for classic mechanical charm, along with luminous hands and applied indices for strong legibility.
Underneath the sapphire crystal sits the Citizen Caliber 8322 automatic movement, an in-house mechanical engine with a 60-hour power reserve — a significant upgrade over entry-level automatic watches and a clear selling point in this segment. The robust movement winds via wrist motion and features a transparent case back for a glimpse of the mechanical rotor in action.
The integrated stainless steel bracelet with a secure butterfly clasp completes the look with comfort and durability. With 50 m / 5 bar water resistance, this watch is suited for daily wear and light splashes, making it a versatile choice for both casual and smarter occasions.
KEY SPECIFICATIONS
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Reference: NK5010-51L
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Movement: Automatic (Citizen Caliber 8322)
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Power Reserve: ~60 hours
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Functions: Hours, Minutes, Small Seconds
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Case Diameter: 40 mm
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Case Material: Stainless Steel
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Crystal: Sapphire
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Dial Color: Blue Sunray
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Bracelet: Stainless Steel (Deployment Clasp)
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Water Resistance: 50 m / 5 bar
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Case Back: Transparent Exhibition
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Condition: Brand New






M.B. (verified owner) –
Slightly heavier than I expected, but it actually feels more premium because of that.