I have searched the web but have not found specific reference to 2 steins that someone brought to my step-mother after a trip to Germany. Both are marked Western Germany with the Thewalt triangle logo. One is marked 0.25L and the other 0.5L. One has an impressed number 4 and the other either 6 or 9. I want to be sure they are of little value before gifting them to a new German restaurant in town. Thanks.