This is the Seiko 9983-7000 a model released in 1978 as Seiko's flagship quartz model with an advertised accuracy of +/- 5 seconds a year. In the 1970's Seiko's quartz watches generally
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This is the Seiko 9983-7000 a model released in 1978 as Seiko's flagship quartz model with an advertised accuracy of +/- 5 seconds a year. In the 1970's Seiko's quartz watches generally,1979 Seiko Grand Quartz 9256-7000,1979 Seiko Grand Quartz 9256-7000 – TokeiMedic,Seiko Grand Twin Quartz 9256-7000 from 1979 – Paleh,Seiko shc043 (sapphlex crystal)