D is for Duck Stamp

sketch of a duck with, 'Ain't that ducky'
Duck Stamps Cinderella Stamp

The U.S. Fish & Wildlife Service issues a federal duck stamp every year to validate duck hunting licenses. Though sold at post offices, these are tax stamps with no postal value. Unlike modern U.S. postage stamps, all of which have designs commissioned by the Postal Service, duck stamp designs are chosen in a competition open to all artists who wish to submit their work.

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Black Scoters plate number remarque by Joe Hautman

A remarque is an artist's print — in this case, a stamp — to which the artist adds a small original sketch or painting in the border. Hautman is a three-time winner of the federal duck stamp competition. United States, 2002.