The original three stripe brand.
Karhu was founded in 1916, changing its name to Kahru from the original, Ab Sportartiklar Oy, in 1920. During its early years pretty much all Finnish athletes wore Karhu which is no mean feat, as during this time they were some of the worlds best in their fields.
During this time their trademark was the three stripes, used on all of the shoes and seen at all of the Olympics courtesy of then being worn by those Finnish athletes. They sold the trademark to one Adolf Dassler in 1951, then created the one they have used since, the bold M, standing for Mestari (champion in Finnish).
Over the years they have innovated at a level that is surprising, unless you are an avid fan. They created the first air cushioned running shoe, for instance. This was done several years before another global behemoth created theirs. 
Karhu, pretty much the epitome of going your own way, not shouting but just doing.