Mankato (KMKO)-A reward is being offered for information about the damage of a sculpture located at Second and Main Streets in Mankato.  Authorities say someone broke the top of a portion of wheat on the bronze and stone sculpture.  The art work, entitled "Tess", is the work of Susan J. Geissler.  The sculpture is valued at $26,000.  The cities of Mankato and North Mankato are offering a reward for information leading to the arrest and conviction of those responsible for the damage.  If you have any information, call the Mankato Department of Public Safety at 387-8780.