Posts 1,211 Likes 1,451 pnwyankee ·Nov 21, 2020 Saw this listed for sale on eBay under the title "Wave of Unrest"
Posts 1,604 Likes 2,719 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 257 Likes 1,100 Vintage8509 ·Nov 22, 2020 Sounds like a translation of the German word “Unruhwelle” (balance staff) that went wrong (Unruhe = unrest & Welle = wave)