it is 3rd, the setup shows the ivy in the late summer in full bloom, plus he's in full running mode, if it was 1st his helmet would be on, if it was 2nd the ivy wouldn't be in the shot.
The original image appeared in the SI Sportsman of the Year article (yeah Pete was Sportsman of the year)
Shot by famous sports photographer Heinz Kluetmeir
He likely was setup against the 3rd base wall, as for the chalk lines they were probably masked out during the development process.
The date issue is typo as the Reds played 25-27 in Chicago that year and that ivy and grass looks at the height of the Chicago as a warm city.
Here's another image that appeared in the article