World's first hand wound quartz - Seiko 8T23 — Plus9Time,【激レア】 SEIKO IMPACT 8T23 - 8020,1986 Seiko ref. SBAD003 (8T23-8020) The world's first manual winding quartz movement was Seiko's Cal. 8T32, released by Seiko in the late 1980s. The wearer would be able to wind the crown,本体超美品 セイコー SEIKO 8T23-8020インパクト 手巻き時計 - メルカリ,【2025年最新】seiko 8T23の人気アイテム - メルカリ