hi - older glasses of better quality usually have a ground/polished depression under the foot - circular in shape and shallow - indicating the glass was completed by attaching it to a pontil rod so that the rim or any other final finishing work could be done back at the glory hole - after being detached from the pontil rod, the 'scar' left from this break needed to be smoothed and polished - hence the depression. You don't mention whether your glasses have that depression under the foot, and if not then these may be modern.
The decoration is not acid etched as you suggest - but was in fact created using a small copper wheel, plus some abrasive liquid or past, and is generally known as 'grape and vine' pattern - so wheel engraved.
This is a very common design on glasses intended for alcohol of one sort or another - in this instance, and bearing in mind the size of your glasses, possibly liqueur.
As far as I can see, there is nothing on these glasses that will enable you to determine origin - almost anywhere in Europe - and determining age will be equally difficult - if you have the depression under the foot then we might put head on block and say pre WW II - but very chancy.
If you flick them do they ring, to indicate lead glass?? - am I seeing a hollow stem? But whatever, they're attractive and always useful, and a good find.
