|Homepage - Contents - J. Quartz Watches with Micromotor and Hands, 11. Ricoh Quartz||< Previous page | Next page >|
|1972||The 'Riquartz' caliber 550, first model with two batteries and later ones with one battery, is introduced. The watch has a frequency of 32 kHz, a stepping motor, a tuning fork quartz and electronic parts made by Hughes Aircraft.|
|1974||Release of caliber 570 also sold by Nivada under caliber no. 88020/21.|
|1976||Marketing of caliber 510 and 590.|
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