[1] Work on the M-1 started in 1955 at the Schempp-Hirth factory, while Matteson was on military duty in West Germany.

The design that Matteson had conceived was adapted to German metric standards and materials by Alfred Vogt who did the early construction work.

The three-piece wing, with a fixed center section and removable tips, featured a foam-filled leading edge and large-sized lower surface dive brakes.

[1] Matteson later sold the completed aircraft and subsequent owners included Dr Gary Grant of Yuba City, California, Robert R. Kirby of Santa Ynez, California and Ron Tabery of Austin Texas.

[5][6] Data from Soaring,[1] The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde Volume II[7]General characteristics Performance