I was going to ask how could I tell the difference between acid etch and needle etch. I have some Tiffin Byzantine etched pieces to compare it to. What I can say is this - The etch on these champagnes is much finer, more precise with less variations in width of a single line than the Tiffin pieces. The Byzantine etch also appears to be deeper than this etch.
I also did an ultra close inspection of each piece, no acid etched siggies on any of them. I did notice though that there was a slight variation in the depth of the glass and the rims are not perfectly even. there is a slight. almost undetectable wave in the rim. I also noticed that where the base meets the stems was not always in round, some looked a little on the oval side. So I am fairly certain that they are hand blown and at least the stems were hand cut and polished (you can also see slight polish marks).
I also found remnants of gold on some of the feather hearts - I don't know if this was a mistake or if at one time they too were gold.
Rubbing a finger across the etches on both pieces (the Tiffin and the champagnes) feels very similar to the touch. The foot appears to be applied, however the stem and bowl appear to be a single piece.
I'm going to try taking some closer photos with a higher macro (and megapixel) camera to see if I can capture in photos what I am seeing in hand. I'll be back with some additional photos.
Thanks so much for you help to this point!
Karen