1c Ultramarine, Grill
(134). Large part redistributed original gum, fresh color, Very Fine,
with 2002 P.F. certificate (Image) 
1c Ultramarine, Grill
(134). Original gum, bright color and proof-like impression, noticeable
grill points, Fine, with 2002 P.F. certificate
(Image)
6c Carmine, Grill (137).
Choice centering with wide margins, dark color, light cork cancel,
Extremely Fine, with 2002 P.F. certificate
(Image)
6c Carmine, Grill (137).
Rich color, segmented cork cancel, few grill points, owner's small
backstamp does not show thru, Very Fine, with 2002 P.F. certificate (Image)
7c Vermilion, Grill
(138). Wide margins and near-perfect centering, rich color,
clearly-defined grill, bold strike of NYFM Geometric cancel, fresh
and Extremely Fine, Brettl backstamp, with 1998 P.F. certificate (Image)
7c Vermilion, Grill
(138). Perfectly centered, sharp impression, clearly visible grill
points, bold NYFM Geometric cancel, Extremely Fine Gem, with 2002
P.F. certificate (Image)
7c Vermilion, Grill
(138). Sharp grill points, detailed impression, bold blue target
cancel, Very Fine, with 2002 P.F. certificate
(Image)
7c Vermilion, Grill
(138). Clear grill points, intense color and impression, light
quartered cork cancel, Very Fine and choice, with 2002 P.F. certificate (Image)
10c Brown, Grill (139).
Choice centering with exceptionally wide margins, clear grill, rich color
nicely contrasted by well-struck bright red New York Br. Transit
circular datestampEXTREMELY FINE. A STUNNING EXAMPLE OF THE 10-CENT NATIONAL GRILLED ISSUE IN THE FINEST ATTAINABLE QUALITY.
With 1962 and 1992 P.F. certificates (Image)
15c Orange, I Grill (141
var). Original gum, lightly hinged, perfectly centered, vibrant color,
the outline of the grill shows on back, tiny sealed tear at left visible
only under magnificationEXTREMELY FINE. THE FINER OF TWO ORIGINAL-GUM EXAMPLES OF THE 15-CENT 1870 NATIONAL I GRILL KNOWN TO US. AMONG THE RAREST IN UNITED STATES PHILATELY.
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 four used 10c, two unused and four used 15c, and one 90c is recorded by Ronald Burns.
With 2002 P.F. certificate (Image)
15c Orange, Grill (141).
Brilliant color, noticeable grill points, neat cork cancel, Very Fine, with
1974 A.P.S. certificate (Image)