Posted By:
Joe D.JC,
Thanks for asking.
The White Sox card is postmarked. And what is very cool about the postmark is that the date is October 9, 1906. October 9, 1906 was the date of game one of the World Series between the White Sox and the Cubs. So the postcard is very specifically dated to the World Series. Pretty cool.
The Cubs postcard was not used postally, but there is writing on the back. It appears that it is someone who wrote down game notes about the World Series. The person who owned this card wrote his opinion as to how the White Sox won games 1, 3, 5, and 6... and how the Cubs won games 2 and 4. Pretty cool baseball content.
here is a scan of the backs:
