The recent "Tours" about IWC cases continues:
Making a Case: Raw Material Machine
https://www.iwc.com/member/forum/search_all.asp?table=archives&subject=case&archived=yes&id=75258
Making a case for the Ingenieur
https://www.iwc.com/member/forum/search_all.asp?table=archives&subject=case&archived=yes&id=73358
Luger's post in the above is worthwhile having a look at to appreciate the case making process.
https://www.iwc.com/member/forum/search_all.asp?table=archives&subject=case&archived=yes&id=73432
Tony Axelzon did a factory tour and it contains some excellent images on the case making process:
https://www.iwc.com/member/forum/search_all.asp?table=archives&sMessage=Axelzon&archived=yes&id=97987
Cheers from the cellar