Product Details Seiko 6159-7010 Professional 600m Diver Tuna Can Titanium The "Professional 600m Diver" (commonly known as the Tuna Can), manufactured around 1975, is characterized by its unique design featuring a large titanium case and protector. This model, which was the world's first to adopt a titanium case, embodies Seiko's strong commitment to the development of deep-sea research and saturation diving watches. The luminous hands and indexes have a beautiful patina finish. This is a rare early model with no "m" at the 6 o'clock position on the dial. ■ Model Number: 6159-7010 ■ Movement: Automatic ■ Material: Titanium ■ Dial: Black ■ Case Diameter: Approximately 14mm x 50mm There are some minor scratches from use, but it is generally in good condition considering its age. No malfunctions were confirmed in a 2-day operation test. The strap shows signs of wear, so we recommend customizing it yourself. This is a rare watch full of vintage charm. Don't miss this opportunity! This is a used item and will be sold as is. Please understand before purchasing.