KOSTA Glasses

Hi , it's been several months since my last post but I've been viewing others ; have acquired more to share with you from thrifting & flea markets around my area of MD .
This is a set of 6 tall ( 5 1/2") Glasses , all etch marked KOSTA on the 2" bases ; there are 2 rows of cut elipses near bottom of glasses . I also purchased 2 stems ( I will post those as well ) in same pattern . Unsure of production dates on these , have done some searching but not pinned down as of yet . Thanks for looking (-: