1978 Seiko Grand Quartz 9943-8020,Twin Quartz: A Seiko Grand Quartz 9943-8000 from June 1978 | Adventures in Amateur Watch Fettling,Seiko Watch GCAT993/8J80-0AD0 Credor Node Quartz Men's Used in Japan – The Japan Pride,Twin Quartz: A Seiko Grand Quartz 9943-8000 from June 1978 | Adventures in Amateur Watch Fettling,Seiko Watch GCAT993/8J80-0AD0 Credor Node Quartz Men's Used in Japan – The Japan Pride,