The product is a block of four US Imperf postage stamps issued in 1933 featuring a view of the Federal Building in Chicago. These stamps are in mint, never-hinged condition and have a purple color. As historical building stamps, they hold a face value of 3 cents and originate from the United States. Ideal for collectors interested in United States stamps from the 1930s, this set captures a piece of American architectural history in a vibrant and detailed design.