This is a SEIKO chronograph wristwatch. There are many scratches on the crystal and case, and it shows signs of use. The crown and buttons are not stuck. The original leather band has deteriorated and has been replaced with a commercially available stainless steel one. There are no extra links. The battery was replaced approximately 2 years ago. It is currently running normally. It has been ultrasonically cleaned before the photos were taken. Weight: Approximately 122g Wrist size: Approximately 16cm Thank you.