1968 Seiko Business-A 8306-8020,Seiko Business-A 8306-8020 Automatic Movement | Wrislabs Store,Seiko Business A automatic Diashock 30 Jewels 8306/8346-8020 day date / case no.7505103 , made in Japan.,Antique Watch Bar: SEIKO BUSINESS-A DIASHOCK 30 JEWELS 8306/46-8020 SBA30 (SOLD),Yahoo!オークション -「business-a」(セイコー) (さ行)の落札相場・落札価格