Abstract: A viewer for slot machines has a dihedral support (7) equipped with a large circular window (8) extended through the faces of the support (7), for the display of a disc (1) of flexible transparent or translucid plastic provided along its circumference with an alignment of images (2). The disc (1) is retained by the support (7) across its circumference and, in one embodiment, permanently maintains a dihedral configuration, showing an observer an alignment of images (2) according to a circumferential arc of variable amplitude according to the level of concealment of the front face of the assembly. In another embodiment, the disc is supported by two bracings so as to assume a “U”-shaped configuration, with two semicircular sectors and one intermediate sector.