These are very fine single needle etched CRYSTAL stemware.  They "sing" when pinged. Part of a set, which hail from the 19th century.

Each in fine vintage order, with one of them having a FLEABITE on the outer rim (please see photo).

They are OPTICAL pieces -- segmented glass that can be easily seen in the photos.  Measurements indicated  also via photographs.

The winning bidder takes the entire set.  HAPPY BIDDING!