50c Columbian (240).
Original gum, deep rich color and proof-like impression, Extremely Fine,
with 1996 P.F. certificate (Image) 
50c Columbian (240).
Original gum, lightly hinged, deep rich color, Very Fine, with 2004 P.F.
certificate (Image) 
50c Columbian (240).
Original gum, lightly hinged, well-centered on fresh paper wtih long full
perfs all around, dark color, Very Fine, with 2004 P.F. certificate (Image) 
50c Columbian (240).
Original gum, deep rich color, Fine, with 2003 P.F. certificate (Image)
50c Columbian (240). Block
of four, original gum, lightly hinged, deep dark color on bright white
paper, Very Fine, a pretty block (Image)
50c Columbian (240).
Well-centered, intense color, tied by bold "World's Fair Sta. Chicago
Ill., Oct. 31, 1893" duplex cancel on piece, Very Fine and choice,
scarce cancel, Scott Catalogue applies a multiplier of over three times for
a World's Fair cancel versus a normal cancel
(Image) 
$1.00 Columbian (241).
Original gum, lightly hinged, brilliant color, well-balanced
marginsEXTREMELY FINE ORIGINAL-GUM EXAMPLE OF THE $1.00 COLUMBIAN.
With 1970 P.F. certificate. (Image)
$1.00 Columbian (241).
Original gum, lightly hinged, choice centering, brilliant color, Extremely
Fine (Image) 
$1.00 Columbian (241).
Original gum, lightly hinged, deep rich color and sharp impression,
perfectly centered with even margins all around, fresh and Extremely Fine,
with 2004 P.F. certificate (Image) 
$1.00 Columbian (241).
Original gum, lightly hinged, radiant color on bright white paper, Fine,
with 2004 P.F. certificate (Image) 
$1.00 Columbian (241).
Original gum, lightly hinged, fresh color, exceptionally well-centered,
small horizontal crease, otherwise Extremely Fine, with 2004 P.F.
certificate (Image)