7c Vermilion, Grill
(138). Small part original gum, noticeable grill points, small internal
tear and tear at right, otherwise Extremely Fine, with 2001 P.S.E.
certificate, Scott Retail as no gum (Image)
7c Vermilion, Grill
(138). Clear grill points, brilliant color on bright paper, neat target
cancel, wide margins, Extremely Fine Gem, a huge stamp, with 2001 P.F. and
P.S.E. certificates (Image)
7c Vermilion, Grill
(138). Sharp grill points, fresh color, bold quartered cork and part of
red cancel, Very Fine and choice (Image)
7c Vermilion, Grill
(138). Clear grill points, intense color and impression, unusual roller
cancel, corner perf crease at top right not mentioned on accompanying
certificate, otherwise Very Fine, with 2001 P.F. certificate (Image)
7c Vermilion, Grill
(138). Rich color, neat NYFM "Clothespins" cancel, fresh and
Very Fine, with 2001 P.F. certificate
(Image)
7c Vermilion, Double Grill
(138 var). Choice centering, vivid color and impression, segmented cork
cancel, small corner crease at bottom left, appears Very Fine, rare
variety, with 1986 P.F. certificate (not noting corner crease) (Image) 
10c Brown, Grill (139).
Unused (no gum), fresh and bright color, Very Fine, with 2000 P.F.
certificate (Image)
10c Brown, Grill (139).
Well-centered, noticeable grill points, rich color, quartered cork cancel,
Extremely Fine, with 2000 P.F. certificate
(Image)
10c Brown, Grill (139).
Choice centering, clear grill points, neat red crossroads cancel,
tiny corner crease at top left, expertly repaired perf at bottom right,
Very Fine appearance, with 1997 P.F. certificate
(Image)
10c Brown, Grill (139).
Well-centered, bold grid cancel, tiny corner crease in bottom left margin,
otherwise Very Fine, with 1988 P.F. certificate
(Image)
10c Brown, I Grill (139
var). Well-defined I Grill points visible on both sides of the stamp,
11 points in width and 12 points in height, rich color, light strike of
cork cancel and trace of green crayon at lower right, short perf at top
rightVERY FINE. THE 10-CENT I GRILL IS ONE OF THE RAREST OF ALL UNITED STATES STAMPS. TO DATE, ONLY FIVE EXAMPLES HAVE BEEN IDENTIFIED.
At least two sizes of grills were used by the National Bank Note Company for the 1870 Issue. They are identified in the Scott Catalogue by a notation preceding Scott 134, which assigns them the letters H and I, but these have not been separately catalogued, as have the different grills used in 1867 and 1868 (A, B, C, D, Z, E and F).
The H Grill is larger than the I Grill, measuring approximately 11-13 points wide by 14-16 points tall when the full dimensions are visible. It is found on all values from the 1c thru 90c. The H Grill is sometimes extremely faint, appearing only as a few pinpoints on the face of the stamp, and H Grill multiples are known with some stamps in the block grilled and others in the same block having no impression of the grill whatsoever.
The I Grill measures from 9-11 points wide by 10-13 points tall. It is usually a stronger grill impression (though sometimes incomplete) with well-defined points, the shape of which differ from the H Grill's points. The I Grill is currently recorded on all values except the 12c, 24c and 30c (there are unconfirmed reports of the I Grill on the 12c and 24c). The 1c thru 7c values make up most of the population of I Grill stamps. The 10c, 15c and 90c I Grills are extremely rare, and it is only in recent years that the existence of three 10c (as of December 2000) and one 90c was reported by Ronald Burns.
With 1984 P.F. certificate (not specifying the grill type) (Image)