I was able to find connections to Jacksonville, Florida of four of the signers of the card.
Gladys Eberhardt - Jacksonville 1910Ethel Westmorland - St. Augustine 1910The signers of the card must have been students of a college or something.
Pearl Holmes - Jacksonville 1910
Mrs. J. A. Heagy - Jacksonville 1930
The card itself is copyrighted 1911 by P. F. Volland & Co. Chicago.