1991 29¢ Pluto
Issue Date: October 1, 1991
City: Pasadena, California
Printed By: Bureau of Engraving and Printing
Printing Method: Photogravure
Perforations: 11 on two or three sides
The Space Exploration stamps give plenty of variety, each stamp in the series is a different, striking design. Each of the nine known planets in our solar system is represented, along with Earth’s moon. Eight of the heavenly bodies are pictured with the exploratory satellites that orbited them.
The promotion of the stamps was tied to the annual October celebration of National Stamp Collecting Month, with the theme “Journey to a New Frontier...Collect Stamps.”
Leonard Nimoy (Mr. Spock) unveiled the stamps aboard the bridge of the USS Enterprise, the starship made famous in the TV series “Star Trek.” “Mr. Spock” was the official spokesman for the stamp promotion.