THIRD REICH UNKNOWN LEATHER SMALL CASE-HEAVILY MARKED 1939 ETC.

A great little leather case for an unknown purpose. Compass? Ranging instrument? Extremely well made and tough. Padded inside to accept somethig round? Waffanampt marked with great small eagle and swastika. Also marked with maker and 1939. There are ink stamps inside, but are very difficult to read.
What is it?

Code: 6221