Giant Square Circle. Tampa: Warren Hamilton, ca. 1960. An open-front box and tube that nests inside are shown empty, then re-nested. A giant production is then made from within. Custom-made giant model, with packing case bearing the name Whitestone, and several trademark Hamilton stenciled designs on the exterior. Metal tube a giant Phantom Tube. 20? high. Paint well rubbed. Still, an attractive custom-made Hamilton prop.