Abstract: A display device in the form of a mounting frame which releasably holds a plurality of coin certification encasements (slabs) in a predetermined pattern. The mounting frame has a plurality of slab seats, each in the form of an aperture dimensioned to receive a slab, a peripheral lip running along the sidewalls of the aperture for retaining the slab in a seated position within the aperture, and at the other end of each aperture a resilient boss on opposing sidewalls. In operation, a slab is placed forceably between the two resilient lips and seated within the aperture, both sides of the coin and its slab being visible. When it is desired to remove the slab from the display device, the user simply forces the slab past the resilient bosses. Alternatively, the apertures may be provided with resiliently biased curved sidewalls which frictionally engage the edges of the slab so as to seat the slab within the aperture.