Unlike my experience with Swiss Gruen p.w. my one experience of Assmann 1896 hunter mvnt. into 1890 Elgin watch case was perfectly painless drop in fit. Lever slot and stem matched exactly. Gruen apparently did the same with earlier Swiss made movements for Columbus. So now maybe in a better than original proper gold case. Who made this case? Next is a rare 12s to go into a 12s Wadsworth gold case.