4c Columbian, Error of Color (233a). Original gum, wonderful deep shade of the error color

A FINE AND FRESH ORIGINAL-GUM EXAMPLE OF THE COLUMBIAN COLOR ERROR IN THE DEEPER OF THE TWO KNOWN SHADES.

The 4c Columbian color error was caused by the use of a wrong batch of ink, and spectrographic analysis has shown that the blue inks of the 4c error and 1c Columbian have the same components. Stamps from at least three panes reached collectors, and the few cancelled examples indicate that stamps used by the public came from at least one additional pane. It is likely that a number of full sheets were printed using the wrong ink, and most of the stamps have simply been lost to philately.

With 1968 P.F. and 1999 certificates

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