Jauch 4th wheel T.T. for PL-78. Jauch movements were used by Herschede and many other American Clock Companies. Restore your high quality Jauch movement with genuine Jauch parts and keep your clock authentic whenever possible. Refer to homepage Herschede-Jauch reference for the PL-78 drawings. Genuine Jauch part availability shown with annotated blue part numbers, all unmarked numbers are no longer available. S.T. = Strike Train. C.T.= Chime Train. T.T. = Time Train.