ISO: 64-40 Cinelli bars. Stars or wings, it doesnt matter
Have:
66-44 Cinelli Champion du Monde '8 pointed star' rough condition
66-42 Cinelli Giro d'Italia '5 pointed star' good condition
64-42 Cinelli w/ winged logo and no name
42mm System 2. I'm not sure what make these are but they fit a 3T stem
44mm Deda 285 anatomics
44mm Bontrager Race anatomic. These probably take the larger stem clamp size of 31.8