6 Lovely Vintage Clear Glass Sherbert / Dessert Cups

We have here 6 low footed clear glass shebert or dessert dishes, just the right size for sundaes, or puddings. The measure 2.5 inches high, and 3 and 7/8 inches across the top rim. 5 of them are exactly alike with thumbprint sort of marks sweeping up the and down from the middle of the stem. The last one is the same except it does not have these marks. They are all in very good condition, no chips, no cracks, and no cloudiness. I believe these are vintage pieces, but I don't know the exact age or maker. They are unmarked.