RPPC of Redland Field ca. 1915
 

I recently traded for this RPPC of Redland Field. The person I got it from knew nothing about the card but I was able to tell her that it is Redland Field based on the advertising for Kirk & Blum Sheet Metal Works.

Kirk & Blum was founded in 1907 and Noko (postcard paperstock) was also founded in 1907. The ballpark opened in 1912.

So, the image has to be from 1912 to sometime in the early 1920s. Any way of narrowing that down? I'm guessing we're seeing a team practice here. Unfortunately, zooming in on the uniforms doesn't reveal much of anything.

Reds postcard
 

Hi- I love mysteries like these. My best offering from your photo is to research
that phrase "Chester Now" on the rightmost portion of the postcard to start.
Then, if in hand you can read more of the script starting "World's" on the
building immediately to the left of the "Chester Now" sign, it may give a clue.
Last gasp is the small ad immediately to the left, and parallel to, the word
"Shavings" (which is just above "Kirk"). Good luck! Trent King