Hi Hubert, I have worked on many of this identical style in the pocket watch size fun to see a WW sized version. I have 100s of old used ww cases as you could imagine, finding one that would fit would be a very time consuming and therefore costly task, if you are simple looking for a protective case maybe easier, of course finding correct PP parts would be near impossible, having said that someone reading this post may have a stash!, in my drawers a have several quality watches in this condition that I use for parts, last week I put a working high end Tiffany, B&M, and several other good high dollar watch movements into my parts drawers, case long since been melted dial sold or destroyed. I sold a quality similar movement to a friend for a parts watch last week for $75 so I would say don’t put to much into it.