[w1331] SEIKO SBAD003 8T23-8020 Quartz Hand winding Day date LED lights up EX/FR,FS - Rare SEIKO 8T23-8020. The 1st hand wound quartz from 1986. | Omega Watch Forums,FS - Rare SEIKO 8T23-8020. The 1st hand wound quartz from 1986. | Omega Watch Forums,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,FS - Rare SEIKO 8T23-8020. The 1st hand wound quartz from 1986. | Omega Watch Forums,