We just feel like giving you this excerpt from Wikipedia:  “The tower, built in 1869 by architect William W. Boyington from yellowing Joliet limestone, is 154 feet (47 m) tall. Inside was a 138 foot (42 m) high standpipe to hold water.”  As for the unused card, its caption gives different data but also promotes the 1933 “Century of Progress” Chicago World’s Fair.  Nice card.  Grade: 1