I can’t remember where I got this soundpost. It speaks for itself. I’m sure there was an idea–perhaps something to do with resonance in the antennae. There have been a few ideas over the last 100 years of putting resonating objects inside of violins
My French doesn’t really exist: does this label offer a “bar of logical harmony”, while implying perfection? Of course after seeing this label under the (wrong side) f-hole, I pulled the end pin and took a look into the violin through the hole.