10c Yellow Green, F. Grill
(96). Original gum, lightly hinged, beautiful rich color, well-defined
grill, near perfect centering with wide margins and long full perfs all
aroundEXTREMELY FINE GEM EXAMPLE OF THE 10-CENT F GRILL. A SUPERB STAMP THAT RANKS AMONG THE FINEST KNOWN EXAMPLES OF THE 10-CENT F GRILL.
This stamp is remarkably fresh, probably owing to its residing in a collection for many years. (Image)
10c Yellow Green, F. Grill
(96). Original gum, intense shade and impression, clear grill
pointsVERY FINE AND CHOICE ORIGINAL-GUM 10-CENT F-GRILL. UNUSUALLY INTENSE COLOR AND IMPRESSION.
A stamp of exceptional freshness. (Image)
10c Yellow Green, F. Grill
(96). Original gum, clear grill, some slight soiling, otherwise Fine,
with 1982 P.F. certificate (Image)
10c Yellow Green, F. Grill
(96). Block of four, original gum, h.r., clear and sharp grills, rich
color, some toning, bottom right stamp natural pre-printing paper
foldA FINE-VERY FINE ORIGINAL-GUM BLOCK OF THE 10-CENT F GRILL.
It is unlikely that any sound, centered blocks have survived, due to the demand for singles. (Image)
10c Yellow Green, F. Grill
(96). Deep shade, rosette fancy cancel, clearly defined grill points,
Extremely Fine Gem (Image) 
12c Black, F. Grill (97).
Original gum, well-centered with wide margins, sharp proof-like impression,
very freshEXTREMELY FINE. A BEAUTIFULLY-CENTERED ORIGINAL-GUM 12-CENT F GRILL. UNUSUALLY FRESH WITH INTENSE SHADE AND IMPRESSION.
With 1996 P.F. certificate (Image)
12c Black, F. Grill (97).
Perfectly centered within enormous even margins, sharp impression,
Extremely Fine Gem, with 1988 and 1999 P.F. certificates (Image)
12c Black, F. Grill (97).
Well-centered, circle of V's cancel, Extremely Fine and choice (Image)
15c Black, F. Grill (98).
Near perfect centering within extraordinarily wide margins, lightly
cancelled, Extremely Fine Gem, with 1997 P.F. certificate for pair (Image)