Benjamin Franklin Z Grill
Many countries have issued postage stamp in the name of great people, this stamp is no less. The Benjamin Franklin Z Grill, or simply "Z-Grill", is a 1-cent postage stamp issued by the United States Postal Service in February 1868 depicting Benjamin Franklin. Even though this is the most valuable stamp, the 15-cent Lincoln Z-Grill and the 10-cent Washington Z-Grill are just as rare too. The name Z originates from the "Z" variety of a grill pressed into the stamp, creating tiny indentations in the paper. Similar to it D & E grills are also used. Gradually the use of grills was found to be impractical and were discontinued in 1870.
Estimated Price : $3,000,000