I'm posting these rare real photo postcards separately from the recent pickup thread for those who would find them helpful in identifying other ballpark images.
The first two show South Side Park in circa 1908. South Side Park was the home field for the Chicago White Sox from 1900 until Comiskey Park was built in 1910.
The third image shows Comiskey Park in 1912 and bears "no betting" signs, ironic given what happened in 1919.
For more, visit
http://www.sportingoregon.com/