A chronograph with a push button at the 12 o'clock position. It was later named 'Tsuno Chrono.' The black bezel gives the overall impression a sharp look.
The case is generously rounded, giving a comfortable bulge when held in the hand. You can see that the lug at the 12 o'clock side is significantly lowered for a better fit on the wrist.
The 12 o'clock side is rounded with a large arc, making it easier to press the push button. The push button is also easy to press and sized so that it doesn't hurt your finger.
The overall roundness of the case contrasts with the flatness of the top of the glass, emphasizing a sense of solidity.
The back of the lugs is deeply conically cut, with a slope extending to the tip of the lugs. The case back is a screw-back, firmly secured.
An asymmetrical case design from top to bottom. The effect of the black sloped bezel gives it a sharp look. The metal band design adds a slightly modern touch to the otherwise classical case.
The contrast of the three sub-dials in silver and black gives a sporty feel. The orange central chronograph second hand further enhances this impression. The sub-dial at 6 o'clock cleverly incorporates the calendar to complete the three-eye look.
The metal band is relatively thin compared to the volume of the case. The fine pitch of the links ensures a good fit on the wrist. The clasp features a raised CITIZEN logo.