It looks like it has the age to it, and period pieces such as this can be sought after especially if the glass is free of cracks or chips. I saw apair of green glass, pewter handled vases go for an amazing £1800 at an auction a few weeks back, but they were exceptional and I'm not suggesting this is a valuable piece, I really have no idea. The pewter has an interesting construction/fastening, but I'm surprised that they didn't continue with the pattern all the way round.
Just a single, close-up, large photo of the impress might be useful to others to help identify maker?