Abstract: A windowed display for displaying baseball cards and similar flat objects that has a front panel having a matrix of cutouts which are smaller in area than the flat objects to be displayed, an intermediate panel having a corresponding matrix of cutouts which are larger in area than the cutouts on the front panel and larger in area than the flat objects to be displayed and a rear panel having a corresponding matrix of slots wider and much shorter than the corresponding width and height of the cutouts on the intermediate panel so that when the front, intermediate and rear panels are attached to one another they form a matrix of display vaults that can be filled by inserting flat objects through the slots in the rear panel and so that the front of the flat objects are viewable through the cutouts in the front panel. An optional transparent rear panel allows the rear of the flat objects to be viewable through the rear panel.