2c Rose Red, Ty. I, Perf 12 x
10 (423B, formerly 425d). Intense shade, unusually choice centering,
neat wavy-line machine cancel, small corner crease and nibbed top right
corner perfFINE CENTERING. APPROXIMATELY 20 USED EXAMPLES OF THIS PERFORATION VARIETY HAVE BEEN CERTIFIED BY THE PHILATELIC FOUNDATION.
The Scott catalogue, which now gives this and four other perforation varieties major number status, states that there are 27 known used, none of which are precancels (and one unused).
With 2001 A.P.S. certificate. (Image)
1c Green, Vertical Pair,
Imperforate Horizontally (424c). Barely hinged, few light adherences on
gum, deep rich color, choice centering, Extremely Fine
(Image)
4c Brown (427). Mint
N.H., rich color on post-office fresh paper, Extremely Fine, with 2002 P.F.
certificate (Image) 
4c Brown (427). Mint
N.H., wide margins, rich color, Very Fine and choice, with photocopy of
2002 P.F. certificate for vertical strip of three, this being the top stamp
(Image) 
5c Blue (428). Mint N.H.,
bright color and crisp detailed impression, Extremely Fine Gem, with
photocopy of 2001 P.F. certificate for block of eight, this being the
bottom right stamp (Image) 
5c Blue (428). Mint N.H.,
deep shade and detailed impression on bright white paper, Extremely Fine,
with photocopy of 1990 P.F. certificate for block of six, this being the
top left stamp (Image) 
6c Red Orange (429). Mint
N.H., brilliant color, wide margins, Extremely Fine Gem
(Image)
7c Black (430). Mint N.H.
block of four with plate no. at top, attractive charcoal shade, almost
perfectly centered, Extremely Fine, Scott Retail as singles (Image) 
9c Salmon Red (432). Mint
N.H., vibrant color, Extremely Fine (Image) 
10c Orange Yellow (433).
Mint N.H., brilliant color, perfectly centered, Extremely Fine Gem, with
2002 P.F. certificate for block of six, this being the top left stamp (Image)
10c Orange Yellow (433).
Mint N.H. bototm margin block of four with plate no., vivid color,
Fine-Very Fine, Scott Retail as singles
(Image)