Bouton's City Dispatch Post,
New York N.Y., 2c Black on Gray Blue, Dots in Corners (18L2). Large
margins, red "Paid/Bouton" cancel, Extremely Fine, ex Hall (Image)
Boyd's City Express, New York
N.Y., 1c Black on Blue Gray (20L18). Large margins, tied by "Paid" in
oval with "New York City Feb. 18 1ct" datestamp on cover addressed to
"Union Square Post Office N. York", docketing at left, Very Fine and
choice, unusual usage of the Boyd's to the post office
(Image)
Brainard & Co., (5c) Black
(24L1). Large margins all around, uncancelled, trace of pen at lower
left, Extremely Fine, a very rare stamp and seldom found in this condition,
ex Schwartz (Image) 
Broadway Post Office, New
York N.Y., (1c) Black (26L2). Three large margins, full at top,
uncancelled, "Broadway Post-Office City Express 2 Cts." oval handstamp at
right on small embossed Valentine cover to local street address, cover with
tiny tear at top and small internal tear -- both clear of stamp but latter
affects express marking, light pencil at top left just touches
stampVERY FINE EXAMPLE OF THE BROADWAY LOCOMOTIVE STAMP ON COVER.
With 2002 P.F. certificate (Image)
Forwarded by Adams Express
Company Worcester Mass. Orange label on back of 1850 folded letter
datelined "Bangor June 8th 1850" to New York City, also with orange
"Bryant & Spear Penobscot Express" label, faint red oval handstamp at
right, light horizontal file fold does not affect labels, Very Fine (Image)
Carnes & Co. City Letter &
Package Express Essay. Business card in red embossed on white glazed,
with logo at left, and address and proprietors names at bottom, logo
with pencil frame and "5" in all four corners, and "City Letter Express"
lightly obliterated by pen, card with light soiling at edges and faint
diagonal crease, pencil on back, Very Fine, this is the only recorded
sketch of Carnes' second stamp design -- the first design, used to
produce Scott No. 35L1, is the same design as the original illustration on
the business card, the second design, used to produce Scott Nos. 35L2-35L8,
is virtually identical to the amended design on the card (Image) 
G. Carter's Despatch,
Philadelphia Pa., 2c Black (36L1). Large margins, huge at top and
bottom, ms. "X" cancel, used on Dec. 10, 1849 folded letter addressed in
blue to Danville Pa., blue "Philada. Pa. 5 cts. Dec. 11" integral-rate
circular datestamp, stamp has usual gum toning, still Very Fine, ex Golden
(Image)
Cheever & Towle, Boston
Mass., 2c Blue (37L1). Two, one cut to shape with ms. "X" cancel, other
uncancelled with square margin clipped at each corner, minor faults, Fine
appearance, very scarce, ex Golden (Image)
(Mead's) City Despatch Post,
New York N.Y., 2c Black on Green Glazed (40L2). Large even margins,
bright fresh color, vivid red "Free" in frame cancel, two tiny corner
creases, otherwise Extremely Fine, ex Hall, with 2001 P.F. certificate (Image)
(Coles) City Despatch Post,
New York N.Y., 2c Black on Green Glazed, Black on Grayish, "CC" (40L4,
40L5). Former with ms. cancel, latter with "Paid" straightline, minor
faults, both with large margins and generally Very Fine appearance, ex
Schwartz (Image) 
City Dispatch, Philadelphia
Pa., 1c Black (41L1). Clear to ample margins, tied by circular grid on
cover to local street address, docketed Mar. 23, 1860, Very Fine and
scarce, ex Golden (Image)