I’m struggling to understand what is a left winding mainspring and a right winding mainspring. Just to clarify, can anyone tell me what is the orientation on this one in the image and what the other one would look like?
Well, I don't know the official terms because I'm only an amateur. What I meant saying "full wind" on the 1575 (which is of course an automatic) is: I turned the crown about 40 revolutions so that I'm absolutely sure the mainspring is in the "slipping area". Thats "full wind of an automatic" for me.
Status update: After 30 hours the watch is 11 seconds ahead of the atomic clock. So the "about +9 result" of the timegrapher seems to make sense. I will observe until sunday evening if this is continuing.