United States 1997 Benjamin Franklin Sheet of Twelve 50-Cent Postage Stamps Mint Never Hinged

This sheet of twelve 50-cent postage stamps depicting Benjamin Franklin was issued to commemorate the 150th anniversary of the first US postage stamp. Interestingly, the sheet was never available at any post office, and was only on sale for 11 days. "Pacific '97" on the sheet refers to a philatelic exhibition held in San Francisco.

First Day of Issue:  May 29, 1997
First Day City:  San Francisco, California
Printed by:  Bureau of Engraving and Printing
Printing Method:  Offset, Intaglio