Thank you for viewing. I am listing this item to organize my collection. This is a highly sought-after Seiko antique, specifically a rare Chronos model with a waterproof case (blue markings). The case has minor scratches due to age, and the dial shows some wear, but this adds to the antique feel. I especially liked the seahorse relief on the back cover and the unique tightening structure, which reflects the manufacturer's confidence in its waterproof technology at the time. I am unsure of the exact accuracy, but it is a working (hand-wound) watch, and the crown winding operation works without issue. This is an old model and has been stored at home by a non-professional, so please check the photos carefully and understand the condition before purchasing. *This item is only listed on my Mercari account, so please be aware of sales on other sites. Citizen Ace Citizen Ace Discus Citizen Parawater Citizen New Master Kokutetsu Homer (National Railways Homer) Citizen Highline Citizen Deluxe Citizen Homer Guppy Seiko Crown Seiko Kokutetsu Crown (National Railways Crown) Seiko Chronos Seiko Seahorse