U.S. #1356a Tagging Omitted
6¢ Father Marquette
Issue Date: September 20, 1968
City: Sault Ste. Marie, MI
Printed By: Bureau of Engraving and Printing
Printing Method: Giori Press
Color: Black, apple green and orange brown
This stamp was issued to honor the French Jesuit missionary Father Jacques Marquette who, with Louis Jolliet, explored the Mississippi River and its tributaries.
Father Jacques Marquette’s Exploration of the Mississippi
In 1673, Father Jacques Marquette and Louis Jolliet embarked on an expedition to explore the Mississippi River. Marquette was especially useful during the voyages, as he knew several Indian languages. He was able to gather information from knowledgeable local Indians. The explorers traveled down the Mississippi, which defines Arkansas’ western border, to the mouth of the Arkansas River.
Now you can own this stamp with rare tagging omitted. Did you know a stamp missing its phosphorescent tagging is considered by many to be similar to a missing color error? The good news is that unlike some error stamps, untagged error stamps are affordable.
What is Phosphorescent Tagging and Why is it Important?
Tagging of U.S. stamps was introduced in 1963 with airmail stamp #C64a. It helps the U.S. Post Office use automation to move the mail at a lower cost. A virtually invisible phosphorescent material is applied either to stamp ink or paper, or to stamps after printing. This “taggant” causes each one to glow in shades of green (red on older airmails) for a moment after exposure to short-wave ultraviolet (UV) light. The afterglow makes it possible for facing-canceling machines to locate the stamp on the mail piece, and properly position it for automated cancellation and sorting.
Some stamps have been printed with and without tagging intentionally, but when tagging is omitted by accident, we collectors are treated to a scarce modern color error. Our stamp experts examined thousands of stamps to find these just for you. Now you can easily give your error collection a boost or explore this fascinating new area of collecting. Quantities are limited, so order your untagged error stamp right away.
And find more tagging omitted stamps here.