So - I have a V2 IWC Top Gun. Was serviced and all works well.
I wear it, take it off, leave on table, and next day date and day have rolled over fine (although date still chanegs at 02.30!!)
I put it on the winder (currently set to vary between clockwise and anti clockwise), and it holds reserve, date changes, but DAY doesn't!!!
Odd - anyone have an idea of reason for this?