DescriptionPane of twenty Alexander Calder commemorative 32-cent stamps issued by the United States Postal Service, 1997. Gummed adhesive. With glassine USPS storage envelope. Calder was a 1919 graduate of Stevens Institute of Technology in Hoboken. A Calder mobile hangs in the lobby of the S.C. Williams Library at Stevens with a black stabile "Hard to Swallow" on the second floor. ---- commemorative / philately