Period German map board. Typically used for artillery plotting or by officers. It is a nice wooden frame with an aluminum plate and a sheet of clear plastic to allow you to put in a map and use a grease pencil to your hearts content. This one has a leather loop for a writing implement and 2 eyelets for a leather carrying strap. This one also has a sheet of paper for 'winkelmessung' which appears to be more modern.These are interesting. I have found one or two that I know were Wehrmacht used, I have also found similar ones that were postwar and used to hold menus at restaurants and I know there is a slightly more modern version still used by archeologists. The layout of this one is like that of the military marked ones I have found, and the materials and age seem like it very well could be an actual WWII era one but I can't say for sure. One corner seems to have some glue in the joint which is a little loose, so I am guessing it was repaired.