Sorry, missed this paragraph. As mentioned earlier breast star and neck badge belong to /approximately/ 1936-1940 time.
As for the case, neck ribbon and miniature rosette - all three belong to the 1960+ time period. Most likely previous owner (or dealer) decided to "freshen up" this set.
The correct case for such set should look like this
After 1937/1938 silver inscription (with golden paulownia) is possible.
Best,
Nick