every watchmaker has experience with this movement - no problem
the case we can not judge - for shure IWC knows how to do this in the best way
(a lot of person don't know how to do correctly!)
the dial we can not judge - no picture, that shows the problem. if there is a visible problem,
that is a devaluation (also for a later sale) - so this is a argument to change it
regards
Stephan