Sorry to be coming a bit late to this thread but I am trying to identify a problem with one of these calibre 127x movements.
My watch looks a whole lot like MKelley's first 105 on page 1 of this thread but with an additional tachy chapter ring. FWIW, the case is marked 252PA and the watch has the earlier rectangular pushers so this model 105 looks like a '50s watch but must be late 1940s?
Between my balance bridge and the main plate, my movement has a curious extra module which actually touches those two plates. It sits just by the word SWISS on the U-shaped chrono bridge and replaces or lies above the two screws on all online photos of the 1270,1275,1278 etc movements. (I have been COMPLETELY unable to find any photo of this extra module). The lower of those 2 screws [it is at about the 1.55 position] is missing and in fact is probably a case retaining screw and may have nothing to do with the problems.
My immediate problem is that although the pusher by the 2 near this module seems to work OK, the pusher by the 4 is completely sunken and does nothing. My repairer threw this watch back in my face when I asked him to see if he could get the 4 pusher working, saying that there is some part missing which holds the pusher out but he refused to elaborate on what part it is, saying only that it isnt available any more, meaning he couldn't (be bothered to) get it.
Anyone know what this module does or what is causing the sunken pusher or what part I need please?