Pan-American Station Registered. Light strike of violet four line handstamp (Bomar B01-05) in top left corner on 1901 illustrated cover showing the "U.S. Government Building" in black & sky blue, franked with 2¢ + 8¢ Pan-Ams tied by oval cancels, Very Fine, only six recorded example of this handstamp. Estimate  $300 - 400. $0 (Image)