1c Ultramarine (206).
Attractive shade, cancelled by perfect Glen Allen Star pre-cancel
with "Glen Allen Virginia May 10, 1880" double-circle datestamp on
label-printing company corner card cover to Burresville Md., trivial cover
edge wear at top right barely affects stamp, otherwise Extremely Fine, an
attractive and rare cover (Image) 
1c Gray Blue (206).
Cancelled by perfect Glen Allen Star fancy cancel with "Glen Allen
Virginia Oct. 1, 1881" double-circle datestamp on label printing company
corner card cover to New York City, cover has illustration of building on
back of cover, stamp has tiny tear at top left, still Extremely Fine and
very rare (Image)
1c Gray Blue (206). Rich
color, cancelled by well-struck Locomotive fancy cancel of South
Hanson Mass., single nibbed perf at bottom and light corner perf crease at
top left, Extremely Fine strike of this rare fancy cancel (Image) 
1c Gray Blue (206).
Perfect centering, tied by bold segmented cork cancel on front cover of a
32-page booklet, "The Postal Service Book", produced in 1885 by the Meriden
Conn. postmaster, E. D. Hall, cover in blue and red on blue paper, content
reads "The Handy Book of the Postal Service has made many friends
throughout the country... The object of this book is to place before every
one the rules and regulations of the post in daily use... The diffusion of
knowledge of this kind insures greater promptness and certainty of mail
delivery." -- content includes information on office hours, domestic and
international postage rates, carriers, money orders, and a list of UPU
participating countries, along with a healthy dose of ads -- small
thumbtack hole at top left, Extremely Fine and rare, we have never seen
another example of this truly spectacular booklet
(Image) 
5c Yellow Brown (205).
Tied by perfect strike of purple "U.S. Postal Agency, Tientsin, 26 May
88" oval datestamp on cover to Rutland Vt., clearly-struck purple "U.S.
Postal Agency Shanghai 31 May 88" oval datestamp, red "San Francisco Cal.
Pd. All Jun. 24" circular datestamp, slightly reduced at
leftEXTREMELY FINE. AN OUTSTANDING COVER BEARING A SUPERB STRIKE OF THE RARE U.S. POSTAL AGENCY AT TIENTSIN MARKING.
The Tientsin oval was typically used as a transit marking on the backs of covers passing through the U.S. Postal Agency. Of the dozen or so examples known, only a few show the oval datestamp used to cancel the stamp at Tientsin. This is one of the finest strikes and covers known to us. (Image)
6c Deep Brown Red (208a).
Block of four, original gum, choice centering and rich color, Very Fine and
choice block of the 6c Reengraved (Image)
10c Brown (209). Mint
N.H., top sheet margin with part imprint, incredibly deep rich color
and proof-like impression, choice centering with wide evenly-proportioned
margins, Extremely Fine Gem, a superb Mint Never-Hinged example of the 10c
Reengraved, with 2000 P.F. certificate for vertical pair, Scott Retail as
hinged (Image)
10c Brown (209). Original
gum, small h.r., perfectly centered with gargantuan margins all around,
rich color and sharp proof-like impression, Extremely Fine Gem, a
phenomenal one-of-a-kind stamp from the Hall collection
(Image) 
30c Orange Brown (217). Mint
N.H., deep rich color on bright paperEXTREMELY FINE. A SCARCE MINT NEVER-HINGED EXAMPLE OF THE 30-CENT 1888 AMERICAN BANK NOTE COMPANY ISSUE.
With 2000 P.F. certificate. Scott Retail for hinged (Image)