This 1909 T206 150/30 series is the first year of the T206 cards. Mordecai "3 Finger" Brown is a Hall of Famer. He won the World Series with the Chicago Cubs in 1907 and 1908. His ERA was below 2.00 for 5 years in a row from 1906-1910. He had 20 or more wins 6 times, and had a lifetime ERA of 2.06 which is the lowest ERA in baseball history among pitchers with 200 or more wins.
This is a portrait card which commands a higher value. This is a very good price for a classic card like this.