From an estate of a man that took Chainsaw milling seriously. He had doubles of every make of Stihls largest vintage saws. One spot in the middle below the logo looks like possible damage or repair or both. Sprocket spins freely and it looks straight. Judging from the stamp on the bar it is 063 gauge and the tip is marked 404 pitch.
It should do you well for milling/slabbing or felling.