The asymmetric case with the crown at four o'clock made the 6105-8110 instantly recognizable; the movies made it immortal. This is the watch on Martin Sheen's wrist in Apocalypse Now, and the nickname has belonged to Captain Willard ever since. American servicemen bought them cheap at exchanges across Southeast Asia, which is why so many led hard first lives before their second act as collectibles.
Produced from mid 1970 to roughly 1977 with the hacking 6105B caliber, it sold in numbers large enough that parts have always circulated freely, and that is exactly the problem: the Willard carries the worst frankenwatch risk in the vintage Seiko world. Correct-looking watches are routinely assembled from parts donors, and the sophisticated ones fool listing photos.
The most famous Seiko diver and the most faked-up honest watch in the catalog. The combination of right case, wrong dial and wrong insert is the standard trap. Ask for caseback engravings, dial feet and movement photos before money moves, and treat any seller who declines as an answer rather than an obstacle.
Production windows and specifications compiled from documented collector references and period catalogs, cross-checked across independent sources; manufacturer records for this era are approximate by Seiko's own account.