Vintage Seiko Tuna 6159 7010 Mens Automatic 600 Titanium Divers Watch. The black dial with patina luminous batons, date at 3 is signed Seiko Automatic professional 600. The high beat 36000 automatic movement is working well, gains 2 secs a day. The two piece case measures 50mm and is signed Seiko 6159 7010, crystal has a chip at 6, crown screws down, bidirectional bezel turns ok, insert has had a repair at 30. Dont miss this one.