hi - I was interested to know quite why Ken was so quick to suggest Hawkes.
- perhaps the op is in the States, which would explain that response.
Copper wheel engraving was a commonplace decoration produced in most countries for many decades - but what strikes me as unusual is the size of of the depression - I'd say unusually large and symmetrical for such small glasses - and this feaure might help to indicate some particular origin. 
Yes Paul it was (1) OP is from the U.S. (2) Hawkes cut/engraved stemware with this type of engraving, far more so than anyone else to the best of my knowledge since Hawkes frequently bought blanks from other Corning glassworks so the supply was almost endless & based on these factors I suggested Hawkes as a possibility even though granted others also did this type of work. Also in the very early 1900s Hawkes introduced a line of engraved glassware called "Gravic". It consisted of naturalistic designs, stone-wheel engraved, and usually left in a matte finish which is what the OP's exhibited so I thought it was worth a shot.
Actually Hawkes still exists today as "Crystal Traditions" (Tiffin, Ohio) who purchased the Hawkes name & logo in 1989 from the Tiffin Glass Co. (even though Tiffin closed in 1983) Tiffin aquired Hawkes in 1964 & from 64 to 80 Hawkes cutting was used on Tiffin blanks.