A lock for a ball display case includes a plate having a plurality of recessed areas spaced radially about the plate. A plurality of posts extend away from the plate in a direction generally perpendicular to the plate. Each post is in general radial alignment with one of the recessed areas of the plate and spaced radially inward from the recessed area. The lock has frangible portions connecting the posts to the plate. The lock is suitable for engagement with a ball display case in a manner that limits access to an object in the display case. The lock is suitable for use by professional graders and/or authenticators to prevent tampering after the object has been graded and/or authenticated and then locked in the display case.