This is the 1969 Sunoco pin. The gas station chain gave away pins of nine different Cubs, Though dated at 1969, they are actually from 1970 since Joe Pepitone is one of the Cubs on the checklist. He was traded to the Cubs during the 1969 season. Also, Sunoco gave away nine more pins of Milwaukee Brewers and the Brewers were the Seattle Pilots in 1969.
With the pin, I now have 97 of the 127 items on the list, good for 76%