Hi,
Facet cut glasses of this type are always problematical,period ones being made in England and Belgium and probably other countries to,then we have the 20th c revival examples though these are most frequently taller cordial types with thicker stems and rather poor wheel engraving of flying birds ,and to the unwary have all the looks of a late 18thc glass
These glasses look to me to be late 18thc early 19thc ,English or Belgian,and in lead glass ,
I always find the use of the terms Flint and crystal very confusing and I believe incorrect, Flint (crushed pebbles) were used in England in the late 17thc while experimentation was ongoing to improve clarity and durability of drinking glass,after the use of lead oxide became widespread around 1685 or so,glasses were referred to as Single Flint or Double flint,thin or thick glasses,it was thought that this referred to the amount of lead used in the mix but is now known to have been the amount of glass,gathers,used to make the item, less gathers 1 or 2 for single flint glasses then 3 or 4 gathers for double flint , ie what we know as Heavy Balusters today,after 1695 ish Single Flint glasses were generally abandoned in favour of the thicker stronger Double Flint ones and the name to differentiate from the 2 was dropped,after time of course various taxes were implemented which contributed to the evolution of lighter glass,Light balusters and balustroids.etc etc , oooooops I have rambled :wsh:
Re the cutting, this looks fine to me and is in fact hexagonal facet cutting not diamond facet cutting and will appear longer in form than diamonds, the depth of the cut is of course determined by the thickness of the stem ,too much depth and the stem looks weedy.
The engraving as has already been mentioned is pretty generic and seen in the 18thc, possible 'Vonech'(I hope thats the correct spelling) glassmakers in Belgium in the late 18th and 19thc who made a lot of lead glass facet stem might be worth a little investigation if you are that way inclined ,
anyway having said all that the proof of the pudding is in the hands , so I even now could not say with 100% certainty I am correct.