12c Black (17). Vertical
pair, unused (no gum), huge margins with traces of adjoining stamps at
left, clear to just touching at places, detailed impression, Fine, Scott
Retail as two singles (Image) 
12c Black (17). Unused (no
gum), large to enormous margins incl. sheet margin at left and parts of
five adjoining stamps incl. large portion of adjoining stamp at right,
detailed impressionEXTREMELY FINE. AN ASTOUNDING UNUSED 12-CENT 1851 STAMP WITH MARGINS RARELY FOUND SO WIDE ON THIS NARROWLY-SPACED ISSUE.
Ex Grunin and Klein. With 1971 P.F. certificate (Image)
12c Black (17). Position
82R1, enormous margins all around with parts of adjoining stamps on all
four sides, light face-free circular datestampEXTREMELY FINE GEM. A SUPERB USED EXAMPLE OF THE 12-CENT 1851 ISSUE.
Ex Hill. With 1987 and 1989 P.F. certificates (Image)
12c Black, Stitch Watermark
(17). Large to huge margins incl. part of adjoining stamp at left, red
grid cancel, Extremely Fine and choice, with 2000 P.F. certificate, Scott
does not give a premium for the stitch watermark variety
(Image)
12c Black (17). Full to
large margins, unusual blue circular datestamp, Very Fine and choice (Image)
12c Black (17). Horizontal
pair, large to huge margins all around, sharp impression on fresh paper,
light circular datestamp, Extremely Fine and choice pair, with 2000 P.F.
certificate (Image)