6c Pink (186). Original
gum, lightly hinged, beautifully centeredEXTREMELY FINE. A SCARCE STAMP IN CHOICE ORIGINAL-GUM CONDITION.
With 2002 P.F. certificate (Image)
10c Brown, Without Secret Mark
(187). Original gum, rich color, fresh and Fine, with 1973 P.F.
certificate (Image) 
10c Brown, With Secret Mark
(188). Original gum, lightly hinged, Jumbo margins all around, deep
rich color and proof-like impressionEXTREMELY FINE GEM. THE 10-CENT 1879 AMERICAN BANK NOTE ISSUE IS RARELY SEEN WITH SUCH UNIFORMLY WIDE MARGINS.
With 2001 P.F. certificate (Image)
10c Brown, With Secret Mark
(188). Beautifully centered with wide margins, deep rich color and
sharp impression, slightly disturbed original gum, a Very Fine and handsome
example (Image) 
10c Brown, With Secret Mark
(188). Original gum, lightly hinged, deep rich color and sharp
impression, reperfed at left, appears Extremely Fine, with 2000 P.F.
certificate (Image)
10c Brown, With and Without
Secret Mark (188 var). Horizontal combination pair, cancels clear of
secret mark area, wide margins and nicely centered, minor light toning
spot, otherwise Very Fine (Image)
10c Brown, With and Without
Secret Mark (188 var). Horizontal strip of four, center pair the
variety, New York oval cancels, some separations with tiny hinge
reinforcements, about Fine, photocopy of 1984 P.F. certificate (Image)
15c Red Orange (189). Mint
N.H., brilliant color, choice centering with wide margins, Extremely
Fine Gem, with 2002 P.F. certificate, Scott Retail as hinged (Image) 
15c Red Orange (189). Mint
N.H., bright color, Fine and attractive, with 1973 A.P.S. certificate,
Scott Retail as hinged (Image)
15c Red Orange (189).
Block of four, original gum, lightly hinged, choice centering, vivid color,
fresh and Extremely Fine (Image)