SEIKO TWIN QUARTZ 9642-5010 DAINI MENS 時計,1979 Seiko King Quartz Twin Quartz men's vintage watch. Model reference 9923-5010,Seiko King Quartz Twin Quartz 9723-5010 Blue Snowflake Textured Dial,Daini Seiko King Quartz - The quartz brother of the King | WatchCrunch,Seiko Twin Quartz | eBay