Habring²-Erwin
turns the A11B (Basis) into the A11S (jumping second). And its installation in the slim 38.5 mm case means Felix now has a twin brother named Erwin. Erwin is at least as handsome and just as big as its older twin, although slightly more plump. Its movement with the jumping second is still a slim 5.7 mm and its 9 mm case fits comfortably beneath even snug-fitting sleeve cuffs. This is made possible by the new design of the jumping second that is much flatter in comparison to earlier hand-wound watch movements with this little complication.