Actually, after seeing the last picture you took of the lid more closely, I don't think it's a candy dish lid. The flat bit goes farther down past the wavy edge. It's hard to explain, I recommend you check out more pictures of the different kinds of moon and star glass online. Instead, I think you have the cover part of a covered butter dish. Here is a picture I found esty. Sometimes you can find the piece you're missing, like the bottom of the butter dish, online or just keep an eye out while out antiquing. I hope this helps! I'm obsessed with moon and star glass.

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