Abstract: A weatherproof display device for changeable display signs to be mounted on a gasoline dispensing pump comprising a transparent weatherproof cover for holding changeable printed display cards depicting the prices and taxes applicable to the gasoline being dispensed. The device includes a thin rectangular box assembly formed by interlocking front and back panels made of a transparent material having a base assembly forming a mounting pedestal and a secured cap forming its top edge and serving as its cover. Insertion and withdrawal of the price display cards is accomplished by lifting the thin rectangular box assembly from its mounting pedestal base assembly, each of which is printed permanently with a specific set of price and tax conditions. The dimensions of each display card conform substantially to the height and width of the transparent panels, and are duplicated so as to be visible from each side.