|Some Revue Thommen Movements - Click to enlarge.|
The winding / setting mechanism, barrel, gear train and lever pallet are exactly the same (for watches made at about the same time) and for setting can have, without modification, a long winding stem as shown in the two centre examples or a short one for cases with a captive crown and stem. The balance assembly on all of these movements may be either over-sprung or Breguet with either a cut compensating balance or a screwed balance (with Elenvar spring). The number of jewels can be varied and a micro adjusted used instead of the standard index for further variation.
The top plates and cocks are clearly different but the main body of the movement is the same except for being drilled differently to take the two studs and between 1 and 4 screws used to locate and secure each cock and plate.