A set of printed cotton United States flags, each featuring a 48-star field arranged in a six-by-eight grid. The flags are mounted on black enameled metal staffs topped with gilt-finished spear-head finials. The set includes a nickeled metal Boulevard radiator holder, which features a central enameled shield emblem with a stars and stripes motif. The base of the holder is stamped with patent information. These items are mounted on a red felt-covered display board alongside original cardboard packaging components and ephemera from Dettra Flag Products of Oaks, Pennsylvania. One label identifies the set as the No. 27 Radiator Flag Set for Automobiles, suitable for use on cars, porches, or windows. A secondary small black box features a yellow label advertising silk window flags. The 48-star flag configuration indicates a production period between 1912 and 1959, with the graphic design and price points suggesting an early to mid-20th-century manufacture date.