This is a vintage Seiko Actus series + SilverWave line automatic watch, the 6306-8000. Released in the 1970s, it was a popular Seiko sports watch at the time. Condition: Tested and working. Time adjustment: Possible Calendar adjustment: Possible Day adjustment: Possible There are some scratches overall, but considering it's approximately 50 years old, it's in relatively good condition. Please refer to the photos for details. Band: Genuine Seiko. Band size: Approximately 16.5-17cm (see images) There may be slight discrepancies between wrist size and watch band length. Thank you for your understanding. ★★★Features: ■This is the top-of-the-line Seiko 5 series. ■Cal. 6306 in-house movement, highly reliable. ■Screw-down crown ★★★Shipping: To ensure the highest quality, the product is carefully packaged and shipped in a box. We usually ship via DHL or Japan Post. Please note that customs duties may be incurred upon delivery to your destination. Your country's customs office or the shipping company may contact you by phone or email regarding customs clearance procedures. Please be sure to answer the phone. We sincerely hope that your product arrives safely and to your satisfaction. We appreciate your understanding and cooperation to ensure a smooth transaction.