The Citizen NK5010-51X is a refined evolution of the popular Tsuyosa line, distinguished by its small seconds sub-dial at the 6 o'clock position. This model features a unique textured "olive green" dial that enthusiasts often describe as having a bronze or mustard hue depending on the lighting. It is powered by the Caliber 8322 automatic movement, which offers a superior 60-hour power reserve and includes a hacking function for precise time setting. The 40mm stainless steel case retains the signature recessed crown at 4 o'clock and is paired with an integrated bracelet featuring a quick-release system for easy strap changes.
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