Mont. Code Ann. § 16-11-146
Penalty for forged license stamp or insignia
16-11-146 . Penalty for forged license stamp or insignia. A person found guilty of forgery under 16-11-134 shall be punished by imprisonment in the state prison for not less than 1 year or more than 14 years. In addition, the department may impose the civil penalties in 16-11-148 .