The Postal Service issued a 37-cent Love - Candy Hearts special stamp in a pressure-sensitive adhesive pane of twenty on January 14, 2004, in Revere, Massachusetts. The stamp features candy hearts, one pink and one yellow, with words and a heart symbol printed on them to spell out "I love you." These little tokens of affection, bearing brief messages, have been a Valentine's Day tradition for more than a century.
The stamp was designed by Michael Osborne, San Francisco, California. Avery Dennison (AVR) printed 750 million stamps using the gravure process.
Postal Bulletin (December 11, 2003/ March 4, 2004).