Breguet

ei8htohms
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I think you're right

Hi Marcus,

I see everything as statistics, so "good enough" may be the perception of some, but if we could keep an additional 5% of the public satisfied with the performance of their watches if the hairspring was less susceptible to magnetism, it's not "good enough" to me. That number is completely made up by the way and I don't know how differently I might have made it up if I was only talking about dress watches.

I suspect that you're right about the utility of an overcoil in a silcon hairspring but that's just based on my understanding of the theory behind the flat silicon hairsprings with variable thickness terminal curves. I've never worked on any watches with silicon bits in them, so I have no idea how the theories might translate to reality.

I'd be very interested to know in particular if the variable thickness terminal curves provide similar performance gains with respect to both positional error AND isochronism that overcoils do. Maybe they don't quite in both regards and the silicon overcoil actually does have something to offer?

_john