Michigan Compiled Laws, Chapter 600. Revised Judicature Act of 1961 § 600.2142

Sec. 2142. Any corporation, joint stock company, or partnership association, limited, may have a common seal which it may alter at pleasure, and such seal affixed to any instrument purporting to be executed by any such corporation, joint stock company or partnership association, limited, foreign or domestic, shall be prima facie proof of the due adoption of said seal, and that it was affixed to said instrument by due authority, and that said instrument was in fact lawfully executed by such corporation, joint stock company or partnership association, limited.