Interesting find. Will'ya wait for daylight and rephoto in macro mode, please. I can't see "the barn" for beans, now. Sometimes etching can be brought out with a light coating of dirt.
Is it milk glass, then? What metal? What's the diameter? Any threading? What's the other side look like?
Figured it was a coin when I dug it. Its brass, with no threading. It appears to have some gold quilting on the inside. It's not milk glass it's transparent. I will take some better photos later today. Thanks, for replying. Joey
Let me start off by saying, I don't know what this is, but I have an idea to what 'family' it belongs. It reminds me of a miniature version of a Magic Lantern slide. The Magic Lantern was an early projector that projected picturesque scenery of various people, places, and things on a wall using glass slides. Maybe your find is similar, just in a smaller version. . . .sort of the antique version of the View-Master or a version of a teleidoscope.[h=1][/h]
Interesting find
Breezie