National Postal Museum
2 Massachusetts Ave., NE
On view in Part I of this exhibition are U.S. stamps from before 1894 from the Benjamin K. Miller Collection. Donated to the New York Public Library in 1925, the collection was the first complete collection of U.S. stamps ever assembled and has been called the "crown jewels" of U.S. stamp collecting for its variety, depth, and rare holdings. This rotation features the rarest of all U.S. stamps—the One-Cent Z-Grill.