Check out the original White Sox card and what I came up with, and what I switched it to:
Only problem was that Robertson was RETURNED to the San Francisco Giants about a month later, which in turn had him released by the end of March, thus ending his Big League career.
So turns out the action he saw during the 1971 season would be the last of his MLB career, which was spent entirely with the Giants between 1966 and 1971.
The 1970 season would be his best, as he posted career-highs across the board due to extended action, with a record of 8-9 along with an earned run average of 4.85 over 41 appearances and 183.2 innings pitched.
He finished his career with a record of 13-14, with an ERA of 4.94 over 86 appearances and 302.1 innings, with a shutout and two saves thrown in.