I am planning to get the small crown on a Portofino Moonphase replaced with a larger crown, as I believe some of you have done. I finally made contact with IWC about this and received the following comment via email:
"Our master watchmaker at our workshop has tested a bigger crown on IW544801 that we have in repair right now. The problem with this case that is different than the other hand wounds is the cut out in the case for the crown. It is still difficult to say that it can be changed because it might not pass the water pressure test with new crown. Then our workshop cannot accommodate your request to exchange for bigger crown. Your timepiece needs to be sent to our workshop for further analysis. Please let me know if you choose to do so."
Can somebody tell me which crown was used for the replacement and if your watch passed this water pressure test or not?
thanks
Ray