| 1967 | During the exhibition 'Montres et Bijoux', the first working prototype of an oversized Longines Ultraquartz is displayed in October of this year. |
| 1969 | On August 20th a prototype of the Longines Ultra-Quartz can be seen on display in Geneva, Switzerland. Its size had been successfully reduced to normal proportions. |
| 1970 | The Longines Ultraquartz is presented at the Basle Fair. |
| 1971 | The Longines Ultraquartz with a cybernetic system, caliber 6512, goes on sale in Switzerland,the only cybernetic watch ever to be produced. The project 'Hour-Glass' comes to an end. There were two models: gold (Ref.no. 8483) and steel (Ref.no. 8482) both fitted with cal. 6512. The IC was not used in this quartz watch. Instead separate micro-sized electronic parts were used (14 transistors, 19 resistors, 7 capacitors). The electronic circuit was developed in co-operation with Golay S.A. in Lausanne. |
To avoid the use of frequency-dividing stages, the watch contained two oscillators, one
controls the other by means of an electronic comparision circuit. Thus 170.7 times a second
the rod quartz oscillator (9,350 Hz) corrects the vibrating motor and stabilises it. The elastic
element of the vibration motor is a torsion strip which holds a coil in a magnetic field at
one end in order to sustain the frequency at 170.7 Hz.
These very interesting watches are hard to find.
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