amanico[JLC Moderator]
402934
Very interesting topic, mon ami. Personally, I would happily get a Grail as a final watch, but just for a brand. About Patek, for example, I would say the 5970P. For JLC, it would be the Gyro One.
For Omega, the vintage Speedmaster Alaska project, or a super manual winding Chronometer. And so on... I am a lost case...