From Henry Yee's latest auction:
The slug dates the photo 10/2/51, right before the start of the 1951 World Series.
But wait! Where are the lights? Lights were installed in 1946, and the concrete bleachers were built in 1937, so the picture was taken sometime between those two years. Oops! That picture was certainly not developed "within approximately two years of when the picture was taken."