Stamp Collecting Missing Color Error

The Most Ironic Mistake in U.S. Stamps – 1986 Ameripex Missing Black Color Error Every stamp collector dreams of owning an eye-catching error - one that "got away" from the government's close scrutiny. Yet who could have imagined a major mistake on an issue dedicated to stamp collecting itself! Compare the missing black errors on this 4-stamp booklet pane with the sound pane that's included and see for yourself! (#2201b)