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J.11 Ricoh Quartz


1972The '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.
1974Release of caliber 570 also sold by Nivada under caliber no. 88020/21.
1976Marketing of caliber 510 and 590.


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Copyright by Pieter Doensen

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