Dear Watchmakers I purchased an IWC Ref. 1871. It seems to be a true project I am looking forward to work on. But the first and probably major problem for me is to open the case. It is a square case body that has cut outs in the corners of the back. Each corner has a tiny bore, too. I did my homework and searched for information online and found a discussion on the Omega forum about the same topic with some hints but with no real result for me. Hints: the case is the same as the o