Original Republic of Vietnam RVN  National Order of Vietnam Grand Cross medal 2nd, second class.

Established in 1950, awarded to any persons both Vietnamese or foreign, living or dead, for outstanding accomplishments in duty or bravery, or lofty virtues or, their unsurpassed knowledge. For second class the star is worn on the right breast.
See photos for condition
Size of medal is 3 3/4 x 3 3/4 inches
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Wood drawers, Rack C, Drawer 7