When an officer discharges ex officio the duties of an office other than that to which the officer is elected or appointed, the officer's official signature and attestation, except as otherwise provided by law, must be in the name of the office of which the officer discharges the duties.
Mont. Code Ann. § 2-16-115
Signature of officer acting ex officio
En
Official source: Montana Code Annotated (Montana Legislature). Reproduced from public-domain Montana statutes; confirm against the official source for the current text. Not legal advice.