The 1876 Centennial Expo was the first World's Fair to be presented in the US, held to commemorate the 100th anniversary of the signing of the Declaration of Independence. The Expo was in Philadelphia, and the lighthouse was not a replica of Ship John Shoal in the Chesapeake, (some accounts have it in Delaware, others in New Jersey), as HL has posted on their site, but rather of Southwest Ledge Light, in New Haven, Connecticut, as Paul has linked to in another thread.
HL382 is 7 1/4" x 5"