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|1978||The first watch equipped with two quartz crystals was the Seiko Twin Quartz caliber 9256. Other calibers are 9923, 9940, 9942, 9943, 9980, 9983, 9920, 9921 and 9923. Maximum deviation of five seconds a year.|
|1979||Seiko cal. 9721, 9722 and 9723.|
|1980||Seiko cal. 9641, 9642, 9681, 9441, 9442, 9443, 9481, 9483 and 9461.|
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