This is a vintage, original Korean War US Army Regimental pin that was on a vintage Eisenhower jacket or Ike uniform Jacket dating between 1950 and 1953. The pin features red stripes above the words Ultimi Primi which I believe is the motto for the 739 Anti Aircraft Artillery MSL Battalion. The vintage jacket belonged to my uncle who served during the Korean Conflict so I can verify its authenticity. The back of the pin is marked "N.S. Meyer Inc New York" with two Shields and is held with two tacks. (See photos) The front appears to be nickel and the backing, brass or bronze. The pin is in great shape, having been stored for 70 years.
For More Information:
http://www.warriorswatch.org/downloads/Army_Mottos.pdf