1c Blue, F. Grill (92).
Deep shade, bold paint-red circle of wedges cancel, Very Fine and
choice, with 1999 P.F. certificate (Image)
2c Black, F. Grill (93).
O.g., clear grill points, fine impression with appealing gray plate wash,
Extremely Fine, with 1992 P.F. certificate
(Image)
5c Brown, F. Grill, Very Thin
Paper (95 var). Unused (no gum), intense shade, rich color, clear
grill, well-centered with perfs clear on all sidesEXTREMELY FINE AND CHOICE. A VERY RARE EXAMPLE OF THE THIN PAPER VARIETY. UNDERCATALOGUED IN SCOTT.
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 in original-gum condition.
With 1975 and 1999 P.F. certificates (Image)
10c Yellow Green, F. Grill
(96). Unused (no gum), wide margins, deep rich color, Extremely Fine,
with 1999 P.F. certificate (Image)
10c Yellow Green, F. Grill
(96). Deep shade, light red cork cancel, clearly defined grill points,
Extremely Fine, with 1999 P.F. certificate
(Image) 
12c Black, F. Grill (97).
Large part original gum, perfectly centered with wide margins, sharp
proof-like impressionEXTREMELY FINE. A BEAUTIFULLY-CENTERED ORIGINAL-GUM 12-CENT F GRILL. UNUSUALLY INTENSE SHADE AND IMPRESSION.
With 1999 P.F. certificate (Image)
12c Black, F. Grill (97).
Well-centered with wide even margins, light cancel and trace of red transit
at B., Extremely Fine and choice, with 1993 P.F. certificate (Image)
12c Black, F. Grill (97).
Perfectly centered, sharp proof-like impression, cork cancel, Extremely
Fine Gem, with 1988 P.F. certificate
(Image)
15c Black, F. Grill (98).
Well-centered, bold blue cancel, Extremely Fine and choice, with 1992 P.F.
certificate (Image)
15c Black, F. Grill, Very
Thin Paper (98 var). Well-centered, distinctive light grayish shade,
light strike of blue town cds, Extremely Fine
(Image)
15c Black, F. Grill (98).
Horizontal pair, beautifully centered, sharp impression, light strikes of
blue cancels, Extremely Fine Gem pair of the 15c F. Grill, with 1999 P.F.
certificate (Image) 
24c Gray Lilac, F. Grill
(99). Original gum, clear grill points, beautiful rich color on bright
freshEXTREMELY FINE. A RARE WELL-CENTERED ORIGINAL-GUM EXAMPLE OF THE 24-CENT F GRILL.
With 1996 P.F. certificate (Image)
30c Orange, F. Grill
(100). Rich color, clear and sharp grill points, wide margins incl.
natural s.e. at R. and incl. part of adjacent stamp, bold circle of wedges
cancel, tiny corner perf crease at B.L., otherwise Very Fine (Image)
30c Orange, F. Grill
(100). Two clear strikes of "Hiogo, Japan" handstamps, clear
grill points showing double grill, bright color, faint diagonal crease,
Very Fine, very rare with the Hiogo cancels, with 1999 P.F. certificate (Image)