Perusing various baseball things on YouTube during the All-Star break, I came across this short video which includes some scenes of Wrigley Field from 1952:
The YouTube page says:
My Grandparents recorded this in 1952 on a trip to New York through Chicago and Washington DC. Pretty cool, in New York they took a river cruise and went by Yankee Stadium and across the river is the Polo grounds home of the New York Giants.
At :10 into the video you can see the marquee, then still painted bluish-green (it didn’t change to its now-iconic red until 1965).