8c Dark Green, 1923 Air Post
(C4). Mint N.H. top margin plate no. block of six, proof-like
impression, post-office fresh and Very Fine
(Image)
16c Dark Blue, 1923 Air Post
(C5). Lightly hinged, perfectly centered with Jumbo margins, deep shade
and sharp impression, Extremely Fine (Image)
16c Dark Blue, 1923 Air Post
(C5). Mint N.H. left margin plate no. block of six, deep rich color,
well-centered, Very Fine (Image)
24c Carmine, 1923 Air Post
(C6). Mint N.H. bottom plate no. block of twelve, signed "Harry S.
New P.M.G., Irving Glover Third Asst. P.M.G. 8/21/23" and "Louis A.
Hill, (BEP) Director", dark color, Very Fine and choice (Image)
24c Carmine, 1923 Air Post
(C6). Right plate no. block of six, top right vertical pair lightly
hinged, otherwise Mint N.H., rich color, Very Fine
(Image) 
65c-$2.60 Graf Zeppelin
(C13-C15). 65c and $1.30 lightly hinged, $2.60 disturbed gum, bright
colors, Fine-Very Fine (Image)
65c-$2.60 Graf Zeppelin
(C13-C15). Mint N.H. bottom plate no. blocks of six, rich colors, usual
natural gum skips and bends, 65c with tear in marginFINE-VERY FINE MINT NEVER-HINGED SET OF GRAF ZEPPELIN PLATE BLOCKS.
An attractive set (Image)
50c Chicago Zeppelin
(C18). Bottom plate no. block of six, top row small h.r., bottom row
Mint N.H. with horizontal gum skip, Very Fine
(Image)
6c Dark Blue & Carmine,
Vertical Pair, Imperforate Horizontally (C23a). Mint N.H. with top
right corner margin, bright colors, Very Fine and choice, with Kessler
backstamps (Image) 
6c Dark Blue & Carmine,
Vertical Pair, Imperforate Horizontally (C23a). Mint N.H. with bottom
margin, rich colors, post-office fresh and Extremely Fine, a superb major
error (Image)