From what I understand, Sinn took over the contract after Heuer. I think they may have even used the left over Heuer case stock in the beginning of their run. Bell and Ross put a couple of models out, but they were made by Sinn too. The Kemmner is constructed like the gen Bundeswehrs. Ray Wong has a sterile version on ebay, but it's a screw down case back, and from what I have heard inferior. Kemmner's "real" company I have heard supplies some big/ expensive names' cases. The think the Kemmner brand is something Roland does on the side. Anyway, I love the watch. Quality through and through. This model was a limited run. I got lucky. Roland still has a few on the side.