First, there’s the SPB501, a revival of Seiko’s first proper dive watch from 1965, and then there’s the SRPL53, the revamped “Samurai” design introduced in 2024.

Seiko nicknames, on the other hand, lean on idiosyncrasies. The SHC057 “Buzzsaw” (for the saw-like bezel); the SKX781 “Orange Monster” (it’s orange and mean-looking); the SKXA53 “Black Bullet” (black ...