The years between 1969 and 1979 were probably Longines' most innovative decade with the giant from St. Imier presenting -- next to several other innovations -- the Ultra-Quartz (1969), the Quartz-Chron / Beta21 (1970) and the Feuille d'Or / Delirium (1979) -- all three #horologicalMilestones and innovative and important. And if I am not completely mistaken they never had such an innovative decade before in their long and rich history and they never achieved something similar thereafter.

Now, the question arises why it is at the same time the most dynamic and the most ignored / overlooked decade?

Details:
- Ultra-Quartz I
- Ultra-Quartz II
- Feuille d'Or / Delirium
- Beta21