The virtuoso Hariolf Schlichtig was just back from a tour with the pianist Sir Andras Schiff.
He was on his way to teach at Munich University on Monday when he remembered he had left his viola and three precious bows on the S-Bahn S1 regional train at Munich Hauptbahnhof.
No trace has been seen of them since.
The viola was custom made for Schichtig by luthier Wolfgang Scharff. The bows are French.