Posts 1,207 Likes 1,450 pnwyankee ·Nov 21, 2020 Saw this listed for sale on eBay under the title "Wave of Unrest"
Posts 1,586 Likes 2,700 Caliber561 ·Nov 22, 2020 "Wave of Unrest" sounds like it's probably a mistranslation of oscillation - the purpose of the balance. The part itself is a balance staff.
Posts 256 Likes 1,099 Vintage8509 ·Nov 22, 2020 Sounds like a translation of the German word “Unruhwelle” (balance staff) that went wrong (Unruhe = unrest & Welle = wave)