Abstract: In a transparency mount of plastic a pair of flap-like covering members are hingedly connected to opposite outer edges of a substantially square base plate having a picture opening therein. The covering members are formed integrally with the base plate and are both adapted to be folded in over one side of the same, against which marginal portions of the transparency are to be seated. In their folded-in positions the covering members, which are generally rectangular in shape, overlap opposite marginal portions of the transparency but leave considerable area portions of the base plate outside the picture opening free, and these area portions are raised to lie substantially flush with the upper faces of the folded-in covering members, thereby stiffening the mount. In their folded-in positions the covering members are retained by pegs protruding from the base plate and entering mating apertures in the covering members, the pegs serving also as positioning means for the transparency.