Abstract: A pair of elongated upper and lower horizontal frame bars are provided together with a pair of upstanding opposite side frame bars. The upstanding opposite side frame bars extend between and loosely end abutting the lower and upper surfaces of the corresponding end portions of the upper and lower frame bars and all of the bars include inner and outer sides with the inner sides having coplanar grooves formed therein and extending longitudinally thereof for receiving the corresponding marginal edges of a poster bound on its edges by the frame bars and with the poster member forming a keying element engaged in the slot of each frame bar and thus keying the bars together, each against lateral displacement relative to the other frame bars transversely of the plane of the associated poster.