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| 1971 | On April 14th, Junghans presents the prototypes of their quartz watch caliber QU 1 to the international press at the Basle Fair. The research had been conducted in co-operation with Para, PUW and Bifora. The watch case was designed by Udo Schultheiss. |
| 1972 | A series of 10,000 pieces (cal. 666.00) had been manufactured when the production ceases. They were equipped with a rod quartz, manufactured by Siemens, Germany and an IC by Motorola. |
| 1974 | 30,000 pieces produced of Cal. 666.02, the first series with a quartz crystal by Motorola and the second series with a small tuning fork quartz crystal. The calibers have been released in five differently designed cases. |
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