Though making a resonance watch is very difficult the basic principle is straightforward and it would seem that there is nothing left to improve
link on in
link the implementation of the Breguet resonance principle in a wristwatch as developed by F.P. Journe. However F.P. Journe has not been content to leave well enough alone and the 2020 version of the Chronomètre à Résonance introduces not only greater complexity but greater refinement
link in the search for precision as well.