Abstract: An improved display sign of the type in which interchangeable indicia can be mounted on both sides, and comprising a plurality of aluminum slats surrounded by an extruded aluminum frame. Each longitudinal edge of each slat is provided with a longitudinally extending hook to interlock with a similar hook on the next slat or, in the case of the top and bottom slats, with a projection integrally formed in a recess in the frame member. The slats are locked into the top and bottom frame members by means of a removable rod extending longitudinally thereof in a complementary shaped channel in the recess in the frame member.