I cant find the brand of my bike?

i just bought a bike and i cant figure out the brand. The sellers said its german,and it has "Mountain" on the sides and "buffalo" on the front. What brand is it? Id be grateful if u found out,and maybe supply a picture to check if its the one i have. Another thing is: next to 1 handle,its says "gripshift max" and its the thingy which changes the speed of the bike(from 1 to 7),but next to the other handle theres another thingy which says grip shift max and it has 1,2 and 3. What does that do?