McMillan's Despatch Post.
Small circular handstamp clearly struck on blue folded notice of note
payable on "27/30 Apl" (no year date, 1855 usage) to local
addressee, Extremely Fine, only three or four examples of this rare Chicago
local-post marking are known, ex Middendorf
(Image) 
New York Dispatch Post.
Bold jet-black strike of oval handstamp on cover to 5 Fifth Avenue, reduced
at right and minor edge faults, Extremely Fine strike of this marking, the
only example recorded by Hahn, who dated it to ca. 1857, ex Abt and
Richardson (Image) 
N.Y. City Express Post.
Sharp strike of double-circle handstamp in red on 8-1/2 by 11 in.
Valentine cover with bronze design on front and back, to Miss Sarah
Bell at 7 Fifth Avenue, with beautiful Valentine enclosure, lace panel and
hand-colored floral design with handwritten poem, also a "Bank of True
Love" facsimile bank note, probably original to cover, Extremely Fine,
believed to be the only known example of this local post marking (Image) 
Page & Keyes, Boston.
Mostly clear strike of red "Page & Keys Letter Delivery, Railroad Exchange
* Court Sq., 2 Cents" circular handstamp on small Valentine cover to
Mr. William Smith at 58 Mirtle Street in Boston, intricate bronze design on
front and back of bluish gray envelope with original Valentine enclosure, a
handwritten poem "To William", small stain spotVERY FINE. ONE OF THREE RECORDED EXAMPLES OF THIS BOSTON LOCAL POST MARKING.
Hahn records three examples of this handstamp, including one dated Mar. 6, 1848.
Ex Blake (Image)
Roche's City Dispatch,
Wilmington. Negative lettering in black oval, readable strike on cover
to U.S. Marshal in Wilmington, Fine, only three examples of Roche's
negative oval handstamp are recorded by Stephen Gronowski (Penny
Post, July 1995) (Image) 
(Schmidt) Jefferson Market
P.O., New York N.Y. Two lines "Jefferson Market Post Office/Y G.
SCHMIDT & CO." in standard Eagle frame handstamp on pink June 2, 1850
folded letter to Frankford Pa., red "New-York 5 cts. 3 Jun." integral-rate
circular datestamp, Fine strike on a fresh and colorful cover, the
Jefferson Market P.O. is believed to have been operated by Godfrey Schmidt,
who was listed in the 1850-51 city directory as Godfrey Smith at 6
Greenwich Avenue (source: Elliott Perry), only two examples of this
handstamp are recorded (other dated Jun. 30, 1850, Mazza collection) (Image) 
Spaulding's Penny Post, Coin
Handstamp, Value Deleted. Bold strike on blue folded letter from the
artist Vernon Henry to Dewitt Bruyn in Buffalo, red "New-York 10 cts. 13
Dec." integral-rate circular datestamp, pencil receipt docketing dated Dec.
16, 1847VERY FINE. THE ONLY RECORDED EXAMPLE OF SPAULDING'S COIN HANDSTAMP WITH "ONE CENT" EXCISED.
Enos W. Spaulding, proprietor of the post, raised the letter rate from 1c to 2c on November 15, 1847. One cover is recorded with the "One Cent" coin strike, which dates from the 1c rate period. After the rate change, the "One Cent" value was deleted from the center (one cover recorded, offered here, dated Dec. 13, 1847).
Ex Needham, Hollowbush and Petri. See Petri's Collectors Club Philatelist article (Vol. 32, No. 2). (Image)
Spaulding's Penny Post, 2c
Letter Carrier Handstamp. Well-defined but slightly faded strike in red
on May 20, 1848 folded cover (with part of contents) to Millard Fillmore as
Comptroller in Buffalo, docketing partly on face of cover, some letters of
address have been scratched out, file foldFINE. ONE OF TWO RECORDED EXAMPLES OF SPAULDING'S LETTER CARRIER HANDSTAMP AND THE ONLY STRIKE KNOWN IN RED.
As noted in lot 543, the rate was changed from 1c to 2c on November 15, 1848. The 2c Letter Carrier handstamp was introduced in 1848, probably in proximity to this May 20th usage. The other recorded example is in black on a May 3, 1849 folded letter.
Illustrated in Petri's CCP article (Vol. 32, No. 2). Ex Golden. (Image)
Stone's City Post, New York
N.Y. Beautiful clear strike of "Stone's City Post" circular handstamp
in red on lace Valentine cover to Benjamin Devoe at 21 Hester St. in
New York City, etiquette label on back, opening tear at right and small
faults in lace panelVERY FINE. ONE OF TWO RECORDED EXAMPLES OF THE STONE'S CITY POST HANDSTAMP.
According to a note by George B. Sloane, this post was probably operated by E. Lamb Stone, who served as a clerk in Harnden's New York office (1839), agent in Harnden's Philadelphia office (1840), agent for Thompson & Co. in Albany (1844), and partner with Pullen (1845) and Pullen, Virgil & Co. (1849). The other recorded cover is dated Feb. 14, 1848. (Image)
Swarts' Branch Post Office,
Chatham Square, New York N.Y.. Ornately-framed Eagle handstamp with
"BRANCH POST OFFICE" straightline and ms. "2 Paid" in magenta ink
and "Paid" in pencil on folded letter to local street address,
docketed "Jan. 1847" -- the month Swarts opened his Chatham Square
Branch Post Office -- waterstainedFINE. ONLY TWO EXAMPLES OF THE SWARTS "BRANCH POST OFFICE" HANDSTAMP ARE REPORTED TO EXIST. THE EARLIEST MARKING USED BY ONE OF THE MOST SUCCESSFUL NEW YORK CITY LOCAL POSTS.
Aaron Swarts' was employed by the Post Office Department at Chatham Square in 1845 and 1846. On January 5, 1847, the Chatham Square branch was discontinued, leaving area residents and businesses without a convenient nearby post office. Aaron Swarts saw his opportunity and on January 15th announced the opening of his local post at 6 Chatham Square, advertising it as the Branch Post Office, although there was no official connection at all to the government Post Office. The cover offered here was docketed "Jan. 1847" upon receipt (the letter is datelined "Wednesday evening", either Jan. 20 or 27). The marking was made from a standard metal device with space at center for the insertion of type. One other example was in the Abt and Golden collections.
Ex Mason. (Image)
Swarts' City Dispatch Post,
New York N.Y., (2c) Red on Wove (136L4). Framelines intact all around,
tied by Hollow Star cancel, used with 1c Blue , Ty. II (7), Plate 1E
shade and impression, two large margins to barely in, tied by sharp strike
of New York square grid on cover to addressee care of "City Post
Office", part of addressee's name scraped awayFINE. A UNIQUE COMBINATION OF THE SWARTS "ROUGH AND READY" STAMP FOR LOCAL DELIVERY TO THE POST OFFICE AND THE ONE-CENT 1851 ISSUE FOR DROP RATE.
Very few covers exist with a government 1c stamp paying the drop rate and a local-post adhesive paying the fee for delivery to the post office. This combination of the 1c 1851 and Swarts' "Rough & Ready" issues is unique. (Image)