Six of all 10 of the United States Postal Service Celebrate the Century souvenir sheets in their original Post Office packaging! Sets include 1900's, 1910's, 1920's, 1930's, 1940's and 1970's Each sheet focuses on one decade from the 1900's, through the 1990's, and features 15 individual stamps highlighting events, people and developments from each decade. All sheets are in mint condition, still sealed in their original USPS packaging inside a sealed plastic sleeve and specially printed cardboard backing. No longer available from the USPS and increasingly difficult to track down, this is a great 20th century collectable or a great addition to your collection. The sheets on the image are the ones you will receive.