Got these today. 5/8". Quite the oddballs. They came from what looked like a solidly late 40s to 60s lot. My first thought was Imperial, however, because I had a couple of clear Imperials lately with that yellow stripe, but in hand these feel like Vitros. If you think Opal, they don't look as such in hand. The top one in particular feels like a Vitro Tri-lite from an alternative universe where the color white and red do not exist.