9x13.5" flattened box including top/bottom lid panels. Cardboard is covered by colorful "Post's Sugar Crisp" waxed paper wrapper. Front panel design includes offer announcement art and back panel is devoted entirely to illustrated ad for set of six box insert premiums offered individually packaged. 1957. One example puzzle is pictured actual size 4x5". Box retains all panels and cover paper although very tight margin trims, particularly along bottom edge of front panel. Still clean front and back. Fine. Scarce cereal box. This is a file copy from the archives of premium creators Sam & Gordon Gold accompanied by a letter to that effect signed by Gordon Gold.