FINE. A RARE MINT NEVER-HINGED BLOCK OF FOUR OF THE 4-CENT COLUMBIAN ERROR OF COLOR.
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 two panes reached collectors, and the few cancelled examples indicate that stamps used by the public came from additional panes. 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 2014 P.F. certificate as a block of nine (five stamps removed). Scott Retail as singles
EXTREMELY FINE GEM. AN ESPECIALLY HANDSOME MINT NEVER-HINGED EXAMPLE OF THE 15-CENT COLUMBIAN.
With 1989 P.F. and 2016 P.S.E. certificates (XF-Superb 95; SMQ $4,600.00)
EXTREMELY FINE GEM. A SUPERB JUMBO-MARGINED LIGHTLY HINGED EXAMPLE OF THE 50-CENT COLUMBIAN ISSUE.
With 2010 P.S.E. certificate (OGph, XF-Superb 95 Jumbo; SMQ $2,150.00)
EXTREMELY FINE. AN EXCEPTIONALLY CHOICE MINT NEVER-HINGED EXAMPLE OF THE $1.00 COLUMBIAN.
With 2009 P.S.E. certificate (XF 90; SMQ $14,250.00).