So have you been able to independently set the day of the week in crown position 2 before, and now it has stopped working? If so, then it needs to be taken to a watchmaker to be looked at.
I can't say for sure on this movement (Cal. 1444 or 1445 I think) but often with day/date watches, the day of the week has to be set by advancing the hands until you get to the correct day, then you can quick set the date to make them correct.
Cheers, Al
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