It was given to me. I have no idea what it is, but I use it to organize thin brass stock. It looks like it may have been used to display thin arrows. The background is green felt. 15 x 19" or thereabouts.
Each cut is angled downwards and 1/4 inch deep at the bottom. I suspect that the device holds 25 long rods of some type, probably fragile ones that need a lot of support. Blowgun darts? I showed it earlier to a technical analyst and he replied by giving me the finger.