3c Rose, F. Grill, Imperforate
(94b). Horizontal pair, original gum, large margins to clear, Fine-Very
Fine (Image) 
5c Dark Brown, F. Grill (95
var). Original gum, lightly hinged, deep rich color and crisp
impression, precise centering, complete grill impressionEXTREMELY FINE. AN OUTSTANDING ORIGINAL-GUM EXAMPLE OF THE 1868 5-CENT F GRILL IN THE PREFERRED DARK BROWN SHADE. A SCARCE ISSUE IN THIS CONDITION.
With 1989 and 2004 P.F. certificates (the former as Brown) (Image)
5c Brown, F. Grill, Very Thin
Paper (95 var). Well-centered, deep rich color and sharp impression,
light strike of circle of V's cancelEXTREMELY FINE AND CHOICE. A RARE WELL-CENTERED EXAMPLE OF THE 5-CENT F GRILL ON THIN PAPER.
The National Bank Note Co. undoubtedly made various attempts to improve grilling quality and efficiency through modifications in the process. Based on surviving stamps, it appears that one modification involved the use of very thin paper, which probably allowed two or more sheets to be grilled in one pass through the grilling device. The 1c (F), 2c (E and F), 3c (E and F), 5c (F), 10c (F), 12c (F) and 15c (F) are found on this very thin paper. They are scarce, particularly the 5c-15c values.
With 1999 P.S.E. and 2000 P.F. certificates (Image)
10c Yellow Green, F. Grill
(96). Original gum, beautifully centered, deep rich color, bright and
fresh paperEXTREMELY FINE. A SUPERB ORIGINAL-GUM EXAMPLE OF THE 1868 10-CENT F GRILL.
With 2004 P.S.E. certificate (Image)
12c Black, F. Grill (97).
Original gum, clear grill points, crisp impressionEXTREMELY FINE. A BEAUTIFUL ORIGINAL-GUM EXAMPLE OF THE 1868 12-CENT F GRILL.
With 2003 P.F. certificate (Image)
12c Black, F. Grill (97).
Unused (no gum), clear grill points, bright shade, Very Fine and choice,
with 2004 P.S.E. certificate (Image)
12c Black, F. Grill (97).
Soft charcoal shade, light target cancel, Extremely Fine, with 1989 P.F.
certificate (Image)
12c Black, F. Grill (97).
Choice centering, bold strike of cork cancel, Extremely Fine, with 2004
P.S.E. certificate (Image) 
15c Black, F. Grill (98).
Original gum, lightly hinged, perfectly centered with balanced margins,
clear grill impressionEXTREMELY FINE GEM. A BEAUTIFUL ORIGINAL-GUM EXAMPLE OF THE 1868 15-CENT F GRILL.
With 2003 P.F. certificate (Image)
15c Black, F. Grill (98).
Original gum, soft charcoal shade, strong grill impression visible on both
sides, replaced pulled perforation at bottom left, otherwise Fine, with
2003 P.F. certificate (Image)
15c Black, F. Grill (98).
Choice centering, neat target cancel, bright white paper, clear grill
impression, Extremely Fine, an outstanding stamp, with 2002 P.F.
certificate (Image)