Please help identify this - Unitron microscope or telescope set?
I've tried my best to figure out what this is, but I couldn't find much information. It is 8 3/4 x 7 3/4 x 4 1/4" wood box with 6 marked (eyepieces ?) that are marked Ke10X, Ke10X Micrometer, 2 of Ke15X (says Bi on the left), and 2 of R5X (says Bi on the left) . There are 2 more (eyepieces?) with no marking and 2 black pieces that look like caps to something although they don't seem to fit anything else in the box, and there is a large round glass piece that is almost 4" in diameter. I see that some Unitron items sell for quite a bit on ebay, but I have no idea how much this set is worth because I can't find anything like it. Any help would be greatly appreciated!