
Both the Great Seal of Michigan and the Coat of Arms were adopted at the Constitutional Convention of 1835. Lewis Cass, Michigan’s second (non-acting) Territorial governor, created the original design.
The Coat of Arms is familiar to us because it is shown on Michigan’s state flag. This first occurred in 1837. From that time, numerous flags were in use bearing the State Coat of Arms, with various designs and emblems. In 1865, an official Michigan flag was adopted with the State Coat of Arms on a field of blue.
Michigan’s current Coat of Arms was adopted by the Legislature in 1911. (MCL 2.21) It is identical to the Great Seal of Michigan with the legend or circle, The Great Seal of the State of Michigan, A.D. MDCCCXXXV, omitted.
Unlike the Great Seal, the Coat of Arms may be printed on documents, stationery, or ornaments with no design or words and disconnected with any advertisement. (MCL 750.247) However, a person who improperly exhibits and displays the Coat of Arms is guilty of a misdemeanor. (MCL 750.245)
Source: Michigan Department of State
 
 
COAT-OF-ARMS AND FLAG (EXCERPT)
2.21 State coat-of-arms; adoption.
Sec. 1.The device and inscriptions of the great seal of the state of Michigan, Anno Domini 1835, presented by Lewis Cass to the forthcoming state, through the constitutional convention and adopted June 2, 1835, and filed with the secretary of the territory, June 24, 1835, and illustrated by a seal with said device and inscriptions attached to a state document, bearing date 1838, and to the constitution of 1850 received and filed in the office of the secretary of state, August 15, 1850, and now on file in said office, omitting the legend “The great seal of the state of Michigan, Anno Domini 1835,” is hereby adopted as the coat-of-arms of the state.
History: 1911, Act 209, Eff. Aug. 1, 1911 ;– CL 1915, 1098 ;– CL 1929, 134 ;– CL 1948, 2.21
Compiler’s Notes: For constitutional provision as to great seal of the state of Michigan referred to in this section, see now Const. 1963, Art. III, ยง 3.
Source: Michigan Legislature