1925 news photo, Culver Pictures Inc.
Due to the dapper, sellout crowd in overcoats... I'd thought it was the WS vs Pittsburgh. On closer inspection, I now believe it's a regular season game, likely against the Red Sox (tough making out the uniform).
Pitcher exhibits a side-arm follow through. Look familiar to anyone (the ball is 3/4 of the way to the plate)? Also, what is the significance of this game? Thankyou, Steve