This is a museum quality reproduction of collar inaignia that was used with the first US Air Mail Wing. This wing was used from 1928 to 1939 and worn by pilots of Delta, Northwest and United who flew the mail. The wing is shown on page xiii of 'Pilots Wings of the United States, 1913-1995, Civilian and Commercial' by Philip R Martin. The original wings were 14k gold. While not an original here is a chance to get this unusual collar insignia in sterling silver with a 24 karat gold plate.