If you still prefer pure mechanical movements then here is the 9SA5 and T0 made to celebrate GS 60th anniversary presented to the HSNY at the end of 2020.
https://www.youtube.com/watch?v=uGd_86i3Zzc
https://grandseikogs9club.com/chronicle-9/horological-society-of-new-york/
Dig deeper with the HSNY:
Jack Forster on the essentials of precision timekeeping.
Roger Smith on the development of a practical watch escapement
More on watch escapements here:
Francois-Paul Journe on resonance in watchmaking.
https://www.youtube.com/watch?v=FqLEP3xNb3U
Another description of resonance in horology here:
https://www.thewatchpages.com/resonance-explained-how-it-works-in-a-watch/
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