These are Franciscan Madeira Olive Green Footed Sherbet by Tiffin
They are STOUT!! I have seen these listed as a Champagne glass and a sherbert cup. They do not feel like Champagne to me, but maybe your inner Viking sees Champagne in one! I don't judge ~ you do you ~ Skol!!
Dimensions are:
~Opening Diameter: 3 7/8 inch
~Base Diameter: 2 5/8 inch
~Height: 3 5/8 inch
~Diameter Around Decorative "Middle": 3 5/8 inch
~Capacity: 6 ounces