激レア】 SEIKO IMPACT 8T23 - 8020 - メルカリ,FS - Rare SEIKO 8T23-8020. The 1st hand wound quartz from 1986. | Omega Watch Forums,激レア】 SEIKO IMPACT 8T23 - 8020 - メルカリ,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,セイコー インパクト 手巻発電 SBAD001 | transpolar Museum | MUUSEO 589212