A ball display case has base and a cover that is securable to the base. When the cover is secured to the base, the cover and base at least partially enclose a space for holding a ball. The case has a pedestal for supporting a ball in the enclosed space. The elevation of the pedestal relative to the base is optionally adjustable. An irreversible lock is adapted for selective application to at least one of the base and the cover such that the lock assumes a locking position that prevents non-destructive removal of the cover from the base. One suitable lock includes a plate having a plurality of recessed areas spaced radially about the plate and a plurality of posts extending away from 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.