WWII era Obsolete Civil Defense Patrolman badge for the city of Baltimore

This is an Obsolete Civil Defense Patrolman badge for the city of Baltimore. The badge is stamped metal with an Eagle over a shield. The center of the shield has an enameled roundel with the Civil Defense emblem on a blue background. Around this is Patrolman and Baltimore.Hm'ed "BASTIAN BROS/CO/ROCHESTER NY".These badges were intended for police personnel acting under Civil Defense authority in an emergency situation and are a neat Cold War memento.