Vintage 70s rotating wood picture frame with 4 openings; The Quad

Vintage 70s rotating wood picture frame with 4 openings; The Quad. Sits on a pedestal base. Pictures can be inserted between the cardboard and the frame. It originally had plastic covers to protect the pictures, but there are only two left and they have yellowed over time. It is free of flaws aside from that, and appears to be unused