They were made by Federal Glass Co of Ohio. There is no zip code, so that means they were manufactured before 1963. I’m guessing they are from the 1950’s. My mom and grandma both had this same pattern. I remember Mom using them once or twice when I was very young.
My favorite way to use them is for lunch, serving a fruit salad or chicken salad in the punch cup. Today we don’t usually serve punch in such tiny cups.