Found this one from second hand shop. Its "old classic" from 70's. this fixture is a part of the Orno Master series designed by Heikki Turunen. It was kind of popular at its time.
Serie consisted two kind of models. one was this kind of narrow body fixture designed for either hanging from ceiling or wall mount (wall mount version had ballast and power outlet at the side of the fixture where also was fixing point to wall.) hanging version like this has a ballast at the end of the fixture. you could adjust direction of the light by loosening the knobs in the ends and then the fixture turns.
second model was wider bodied and ballast was behind lamp makind fixture as long as the lamp. These kind of fixture had ceiling or wall mound option available also. there was also connection pieces available so you could connect fixtures together for example above bank teller desk to form one long fixture. this connection pieces also worked as joint so bendings was possible.
different colors were available but most common one was white.