Leitz Wetzlar 21mm viewfinder with case

This is a Leitz Wetzlar 21mm viewfinder, made in Germany. It includes an original Rollei leather case. The viewfinder is in used condition with some signs of wear, as shown in the pictures. The optics appear clear. The case shows some scuffing and discoloration. Functionality is presumed to be good, but has not been tested. Please review all images carefully for condition assessment.