Marked "BIEFFE", "MADE IN ITALY", B85, etc.

I am not sure what adult size this is.  The opening is 10 1/2" front to back and 7 3/4" side to side.  Please compare to your helmet to be sure of fitment.

Add some padding and refurbish?  The inside is dry and should be replaced.  Still has the original straps but they do have surface rust.  The outside has some signs of age.  SEE PICTURES.