5c Chocolate (255).
Original gum, barest trace of hinging, well-centered, deep rich color on
bright white paper, Extremely Fine, a beautiful stamp, with 2000 P.F.
certificate (Image)
5c Chocolate (255). Block
of four, original gum, bottom right stamp Mint N.H., others lightly hinged,
Very Fine-Extremely Fine block, the bottom right stamp is an Extremely Fine
Gem (Image) 
5c Chocolate, Vertical Pair,
Imperforate Horizontally (255c). Original gum, unusually choice
centering, fresh color and detailed impressionEXTREMELY FINE PAIR OF THE RARE UNWATERMARKED 5-CENT 1894 ISSUE IMPERFORATE HORIZONTALLY.
It is believed that most examples of this error originate from a part sheet purchased by a collector at the Richmond Va. post office. The unique unused block of nine with imprint and plate number, ex Col. Green collection, also originated from this find.
With 1991 P.F. certificates (Image)
6c Dull Brown (256).
Original gum, lightly hinged, wide margins, bright and fresh, Extremely
Fine, with 1979 P.F. certificate (Image)
8c Violet Brown (257).
Mint N.H., dark shade and proof-like impression, Extremely Fine, with 1985
P.F. certificate (Image) 
10c Dark Green (258).
Original gum, lightly hinged, bright color and sharp impression, Very Fine
(Image) 
15c Dark Blue (259).
Original gum, lightly hinged, dark color, Extremely Fine, with 1992 P.F.
certificate (Image) 
15c Dark Blue (259). Part
original gum, h.r., intense color and impression, well-centered, Extremely
Fine, with 2000 P.F. certificate (Image) 
15c Dark Blue (259).
Original gum, barely hinged, intense shade and impression on bright paper,
light horizontal crease at top, otherwise Extremely Fine, with 1998 P.F.
certificate (Image) 
50c Orange (260). Mint
N.H., perfectly framed with enormous even margins, brilliant color and
sharp impressionEXTREMELY FINE GEM. THIS STAMP IS WITHOUT QUESTION THE FINEST EXAMPLE OF THE 50-CENT 1894 UNWATERMARKED BUREAU ISSUE IN EXISTENCE.
The unwatermarked 1894 Issue was the Bureau of Engraving and Printing's first effort producing postage stamps. As collectors know only too well, the 1894 unwatermarked stamps are typically poorly centered with irregular perforations. Issued quantities of the higher values on unwatermarked paper were small -- only 175,330 of the 50c, compared to 244,110 of the 30c 1869 -- and collectors have hinged most of the supply in philatelic hands. This 50c stamp has margins and centering rarely seen on any copy, used or unused, and its Mint Never-Hinged condition elevates it to the top of its class. If anyone owns a Scott 260 of equal quality, we would like to know about it.
In his three-volume work on 19th Century United States stamps, Lester G. Brookman wrote the following about the 50c 1894 Issue: "There are few, if any, of the 19th century U.S. stamps that are so difficult to find in superb used condition as is this stamp. The price for commercial copies of this stamp can well be multiplied by 10 and the buyer of a superb copy of this stamp at such a price can rejoice in the fact he has a bargain!" Brookman's comments apply equally to 50c stamps with original gum and actually understate the value of a Mint Never-Hinged example.
Ex Hewitt and Zoellner. With 1998 P.F. certificate. (Image)
50c Orange (260). Original
gum, lightly hinged, radiant color, Very Fine and choice, one of the
scarcer Bureau issues in this condition, with 1991 P.S.E. certificate (Image)