Coat of Arms of Missouri. Atleast Semi-official, used in the State Seal and State Flag, and some government websites, and referred to as a coat of arms in the Statute of the adoption of the State Flag 

http://www.netstate.com/states/symb/flags/mo_flag.htm
Seal_of_Missouri.svg
Seal_of_Missouri.svg: Designed by Judge Robert William Wells
derivative work: Fry1989 (talk) 23:38, 5 October 2010 (UTC)