I would say that it is the right size, and shape, and weight, to be a Christian Communion-service "wine" cup... which is something I've personally seen and used many times. Those are base-heavy so that despite their small size they don't tip over easily when a group of them are carried to the altar on a serving-tray -- nor when fumble-fingered kids and shaky elderly folks try to pick one up from the group on the tray.