The $1 - $5 stamps were the first U.S. stamps with a face value above .90¢. Unlike the smaller denomination stamps, these stamps were not priced for a specific postal product such as first class, parcel post or registered mail.
$1 U.S. 1893 Columbian Exposition Stamp
From Michael Breen, former About.com Guide
$1 “Isabella Pledging Her Jewels” - From a Painting by Antonio Degrain
$1 U.S. 1893 Columbian Exposition Stamp
Image Courtesy Wikimedia Commons