Seiko Tuna
Nicknamed for the shrouded, canister-like case protecting the crystal and crown gasket on Seiko's most extreme professional divers, starting with the automatic 6159-7010 in 1975.
4 references
“Differs” marks a spec with different recorded values. — means not recorded.
| Spec | 6159-7010 Grandfather Tuna | 7549-7009 Golden Tuna | SBBN013 Baby Tuna | SBBN031 Marinemaster Professional 1000m |
|---|---|---|---|---|
| Case size Differs | 49.6 mm | 49.6 mm | 48 mm | 49.4 mm |
| Thickness | Not recorded | Not recorded | 15.3 mm | Not recorded |
| Case Differs | titanium shroud, steel case, round | titanium shroud, gold-tone titanium case, round | titanium, ceramic, and stainless steel, round | titanium, round |
| Bezel Differs | unidirectional rotating | unidirectional rotating | unidirectional rotating | ceramic unidirectional rotating |
| Crystal Differs | hardlex | hardlex | sapphire | sapphire |
| Water resistance Differs | 600 m | 600 m | 1000 m | 1000 m |
| Caliber Differs | 6159A | 7549 | 7C46 | 7C46 |
| Movement maker | Seiko | Seiko | Seiko | Seiko |
| Movement type Differs | Automatic | Quartz | Quartz | Quartz |
| Jewels | 17 | Not recorded | Not recorded | Not recorded |
| Dial | black | black | black | black |
| Bracelet | Not recorded | Not recorded | Not recorded | titanium |
| Produced Differs | 1975–1977 | 1978–1984 | 2009–2015 | 2009–2017 |