The Benjamin K. Miller Collection of the New York Public Library had not been seen by collectors or the public since 1977 until it was displayed at the National Postal Museum
from May 2006 to March 2009. Rarity Revealed: The Benjamin K. Miller Collection showcased U.S. stamps from before 1894, the year the Bureau of Engraving and Printing took over printing stamps into the 1920s. Now that the exhibit has closed, a new online featured collection of Millers great rarities and highlight treasures is available on the Arago Web site at www.arago.si.edu/flash/?eid=60[s1=6]
The Miller Collection was the first complete U.S. stamp collection. By the time he donated his collection to the library in 1925, Miller owned at least one copy of every U.S. stamp listed in the Scott postage-stamp catalog of his day. To a modern observer, the best-known example of its completeness would be the one-cent Z grill, the rarest U.S. stamp, of which there are only two known copies. Other highlights include classic rare stamps, errors in production, early vending-machine stamps, coils and perforation varieties and bluish papers. Millers Inverted Jenny airmail stamp, the purchase that inspired him to collect stamps, is one of the several stamps with inverted centers in the collection.