A very nice case (in its day) but if it is in the same condition as the one that came with my Grandfathers Winchester takedown Model '94 I would bet it is not good for regular use.
Mine is marked 'Winchester' but suspect it was made for them as I have two others that are nearly identical that do not have the 'Winchester' name on them.
That is very cool with the sleeve for the second barrel set.
You can search or Ebay (where I found my other two) but it is a crapshoot. One was in ok shape the other was no better than my original. There are people who specialize in renovating these cases but I don't know of anybody to recommend.
BTW - As I understand it that is not a 'leg o mutton' case as those are hard sided cases. A Google search should find you pictures of a true 'leg o mutton' case.