United States. Four Sons in the Service Pins

Each pin in sterling silver with red, white and blue enamels, marked "STERLING" on the reverse, One Star version measuring 12.7 mm (w) x 7.5 mm (h), Two Stars version measuring 13 mm (w) x 7.7 mm (h), Three Stars version measuring 12.8 mm (w) x 7.7 mm (h), Four Stars version measuring 14.2 mm (w) x 7 mm (h), each with a horizontal pinback, intact enamels, extremely fine.