While it?s certainly true that every Seiko dive watch has its fans, I?d argue that no diver has a more dedicated and hardcore base of support than the Tuna. This series of watches has all the trappings of a cult favorite: an unusual case shape that devotees insist wears extremely well, a history as one of the most tech forward dive watches in Seiko?s catalog and an association with actual professional divers, and a steady stream of variants with different movements, case sizes, and colorways that keep collectors interested. Seiko just unveiled a new limited edition Tuna that seems focused on old-school Seiko historians and collectors, paying homage to one of the brand?s most important divers released thirty-five years ago. This one is a little inside baseball, but for enthusiasts with a deep interest in all things Tuna, it?s easily one of Seiko?s most noteworthy recent releases. 
First, a little background to understand the context behind this new watch, officially dubbed the Seiko Prospex 1986 Quartz Diver’s 35th Anniversary Limited Edition (as always with Seiko, a mouthful). The first Tuna was released in 1975, and with its distinctive shrouded case it set itself apart from other dive watches as an instrument clearly designed for professionals. The so-called ?Grandfather Tuna,? reference 6159-7010, was created by Seiko after receiving a letter from a pro diver asking for a watch that could withstand not just extreme depth, but also shock. This gave birth ...