• Not to be confused with MB&F (Max Büsser and Friends)

Buser Freres & Cie SA (Buser) was a Swiss watch brand active in the middle of the 20th century.

Buser Freres was founded in Niederdorf, with a branch at Reigoldswil. The company produced watches under the Buser and Nidor brands. The brand was incorporated into the MSR in 1961 with Franz Buser serving as Director. It had relocated to La Chaux-de-Fonds by 1966. The brand was retired after 1978.

The Buser family later became involved in the Swisstime concern.