The Mentor brand of watches is closely associated with Bader Ltd, Bader SA, and Bader & Hafner, based in Holderbank, Switzerland. Bader registered the Mentor trademark, featuring an Art Deco style logo, on January 10, 1962. However, the brand name "Mentor" itself was registered earlier, on July 11, 1941.

Mentor watches were designed as practical, everyday timepieces rather than luxury items. They offered a wide variety of designs and styles for both men and women.