Seiko 6105 (For parts or not working) — USD 1,243 on eBay

The Seiko 6105 represents the brand's Diver 150m model, produced from 1970 to 1977. This reference serves as Seiko's automatic diving watch offering with 150-meter water resistance, positioned within the manufacturer's professional dive watch lineup during this production period. The watch features a 42mm steel case fitted with a Hardlex crystal and unidirectional rotating bezel. The black dial is powered by the automatic caliber 6105A movement, which provides a 41-hour power reserve. The timepiece comes equipped with a NATO strap as standard. This reference appeals to collectors seeking vintage Seiko dive watches from the 1970s production era. The 6105 attracts enthusiasts interested in automatic movements with substantial power reserve capabilities and those who prefer the practical functionality of NATO strap configurations. The seven-year production run from 1970 to 1977 makes various examples available to collectors at different price points.