1c-3c, 6c Columbian (230-232,
235). Incl. two 1c, Mint N.H., rich colors, Very Fine-Extremely Fine (Image)
2c Columbian (231). Mint
N.H. bottom left corner plate no. 167, imprint and "P P" block of ten,
each stamp "broken hat" variety, rich color, small natural gum skip
on bottom right stamp, Very Fine and choice, Scott Retail with no premium
for variety (Image)
3c Columbian (232). Mint
N.H. bottom plate no. 76, imprint and "R" block of eight, rich color, light
natural paper wrinkle at bottom of sheet margin, Fine
(Image)
4c Columbian (233). Mint
N.H. bottom plate no. 18, imprint and "D" block of eight, rich color,
bottom left stamp small internal tear, otherwise Fine
(Image) 
4c Columbian, Error of Color
(233a). Mint N.H., deep rich color on fresh and bright paperFINE AND PRISTINE. ONE OF THE FEW AVAILABLE MINT NEVER-HINGED EXAMPLES OF THE RARE 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 1972 and 2002 P.F. certificates. (Image)
5c Columbian (234). Mint
N.H. with plate no. at bottom, Jumbo margins, Extremely Fine Gem, a
beautiful stamp (Image)
6c Columbian (235).
Original gum, lightly hinged, intense color and impression, choice
centering, Extremely Fine, with 1983 P.F. certificate
(Image)
6c Columbian (235). Mint
N.H. bottom plate no. 104, imprint and "Z" block of eight, rich color,
fresh and Fine (Image) 
8c Columbian (236). Mint
N.H. with sheet margin at left, rich color and detailed impression,
perfectly centered with wide and well-balanced margins, Extremely Fine Gem,
a superb stamp in every respect, with 1986 P.F. certificate (Image) 
8c Columbian (236).
Original gum, barely hinged, deep dark color, choice centering, Extremely
Fine (Image) 
10c Gray Black, Columbian (237
var). Original gum, lightly hinged, perfectly centered with Jumbo
margins, Extremely Fine Gem example of this sub-shade, with 1979 P.F.
certificate (Image)