This timepiece is a crucial ancestor in the lineage of Seiko dive watches, famous not just for its robust quality but also for being worn by Captain Willard (Martin Sheen) in the iconic film Apocalypse Now, which cemented its legendary status. The Seiko Automatic, reference 6105-8110, is immediately recognizable by its substantial, asymmetrical "Turtle" or "Cushion" shaped case, which offers unparalleled wrist comfort and crown protection. It houses the dependable Seiko Caliber 6105, a robust, in-house 17-jewel automatic movement that was a workhorse of its era, providing excellent reliability with its date complication.

The watch features a bold, black dial, large luminous markers, and a bi-directional rotating bezel, all designed for superior legibility and tool-watch utility. The serial number 5D6722 confirms a production date of May 1975, placing it squarely within the golden age of Seiko's professional dive watches. This is an essential and highly collectible piece for any enthusiast who values genuine military and cinematic history combined with robust mechanical excellence.