Abstract: A sealed display assembly for displaying a sign or sheet poster includes a front cover frame mounted over the rear member and having a front vertical wall with a viewing opening therein, and top, bottom and side peripheral walls extending rearwardly from said respective margins of said front wall and shaped and sized to interfit with forwardly extending peripheral walls of the rear member. A compressible sandwich of elements includes a sign or poster-forming sheet fit between the cover frame and rear member. It includes an imperforate transparent panel mounted behind the front wall of the cover frame, the poster or sign-forming sheet mounted behind the panel wall of the cover frame, a compressible sealing gasket along the margins of the rear surface of the panel and extending around and sealing the sheet, and a body of compressible material behind the sheet and pressed by the cover frame against the rear member.