If you mean the watch. I stand to be corrected - but I believe it is all done via the crown and geared together. So if it stops you have to hand wind through the days amd months to get to the correct day / date / month / year. If you over wind you have to stop it and wait for it to “catch up”.
manual:
https://www.iwc.com/content/dam/rcq/.../8/1534328.pdf