Watching, I am a shot glass collector. The reason the glass is green is because of the copper in it. can't tell the age of it without some type of markings but it is a very interesting piece very nice!
I have another one listed its a brwn one . And thnx my granny bought theese from somewhere when I was little .when I got,myy own house she gave them to me . I dont drink so I mever used them lol