Messer manufactured on a different factory line from the Messer Type-F used by Hathaway's group as their main force. To differentiate it, the unit was designated Me02R-M01 Messer Type-M01, commonly known as the Type-M. Due to the nature of their guerrilla operations, its origin had to be concealed. While its external appearance differs significantly from the Type-F, its internal frame and basic specifications are built to the same standards. Gauman used it as a replacement for the Type-F he lost in the Davao air raid. The paint on the left shoulder of Gauman's machine was not completed in time, leaving the base color of the part exposed.