Mich. Comp. Laws § 2.26: State coat-of-arms; use on official letterheads and documents.

Sec. 6.

No pictorial device other than the arms of the state shall be used in the public offices at the capitol for letter headings and envelopes used for official business. Persons printing and circulating public documents under the authority of the state, when they use a vignette, shall place upon the title pages of the documents the device of the state arms herein prescribed without alterations or additions.