Pomeroy's Letter Express, (5c)
Black on Yellow, Value Incomplete (117L2). Position 12R, ample to large
margins, cancelled by "Cd." (not tied), ms. "Paid P&Co." next to
stamp, used on Aug. 14, 1844 folded letter from Geneva N.Y. to New York
City street address, red "Boyd's City Express Post, Aug. 16 9 O'C"
framed datestamp, file folds, one thru stamp at left barely creasing
itVERY FINE APPEARANCE. AN ATTRACTIVE COVER BEARING THE EXTREMELY RARE POMEROY STAMP WITH BLANK VALUE -- APPROXIMATELY 10 TO 12 EXAMPLES OF THIS STAMP ARE KNOWN ON COVERS.
Ex Caspary. (Image)
Pomeroy's Letter Express, 5c
Black on Yellow (117L1). Full to large margins, tied by smear from red
"Cd." cancel, matching "POMEROY'S MAIL" straightline on Jul. 20,
1844 folded letter from Buffalo to New York City, Extremely Fine, a superb
example of Pomeroy's stamp and the scarce Pomeroy straightline, ex
Steinmetz (Image) 
Pomeroy's Letter Express, 5c
Black on Yellow (117L1). Large to huge margins, proof-like impression
on brilliant colored paper, cancelled by perfect strike of red "Cd.",
impression ties thru paper on July 3, 1844 folded letter from
Buffalo to New York City street address, red "Boyd's City Express Post,
July 5 9 O'C" framed datestamp, letter states "Pomeroy & Co. are
carrying letters now between here & N.Y. for 6c each or 20 stamps for a
dollar. It reduces the expense."EXTREMELY FINE. ONE OF THE EARLIEST COVERS SHOWING GENUINE USE OF POMEROY'S LETTER EXPRESS STAMP.
It appears that Pomeroy's Letter Express introduced stamps immediately upon announcing service on June 26, 1844. The earliest recorded cover is datelined Albany, June 27, 1844 (ex Hollowbush, John A. Fox sale, Jan. 4-5, 1966, lot 1407), followed by covers dated June 28, July 1 and 3. This July 3rd cover is a first-week use of the new stamps.
Ex Emerson. (Image)
Pomeroy's Letter Express, 5c
Black on Yellow (117L1). Large margins, cancelled by red "Paid"
straightline, matching "Pomeroy's Mail" two-line handstamp on Aug. 13, 1844
folded letter from Albany to New York City, street address added, red
"Boyd's City Express Post, Aug. 14 9 O'C" framed datestamp, file folds,
one thru stamp (pressed), otherwise Very Fine, attractive conjunctive use
with Boyd's, the Albany "Paid" is very scarce (see lot 379) (Image) 
Pomeroy's Letter Express, 5c
Black on Yellow (117L1). Position 1L, top left corner sheet margins,
other sides large, slightly oxidized, cancelled by red "Cd.", impression
ties thru paper, also cancelled by ms. "C" and "H" initials, used on Aug.
8, 1844 folded cover from Albany to New York City, street address added,
red "Boyd's City Express Post, Aug. 10 3 O'C" framed datestamp, file
folds clear of stamp, Very Fine, scarce cancellations and an attractive
conjunctive usage with Boyd's (Image) 
Pomeroy's Letter Express, 5c
Black on Thin Bond (117L4). Horizontal pair, huge margins all around,
each stamp cancelled by red "Paid" straightline (applied at Albany -- see
notes below), tied by impression thru paper, red "Pomeroy & Co. Express"
handstamp (cut down from earlier circular device) on Aug. 17, 1844 folded
letter from New York City to Buffalo N.Y., refolded slightly at
rightEXTREMELY FINE GEM. ONE OF THE FEW POMEROY COVERS KNOWN WITH A MULTIPLE OF ANY SIZE. A SUPERB COVER.
Yielding to pressure from the government, Pomeroy announced the suspension of its letter-carrying business on August 3, 1844. However, dated covers prove that Pomeroy continued to carry mail through the first week of October (two covers recorded). This cover, dated August 17, 1844, falls into the period following Pomeroy's termination announcement.
The red "Paid" cancel can be attributed to Pomeroy's Albany office through four other examples, including the following three. One is the Aug. 13, 1844, folded letter from Albany to New York City offered in lot 377. The second is an Aug. 16, 1844, folded letter with a strip of three 5c Red 117L5 from Albany to Norwich. Both covers have the same "Paid" straightline and the "Pomeroy's Mail" handstamp, which were definitely applied at Pomeroy's Albany office. A third example is the cover front to England via Albany with two pairs of the Black 117L4 stamp, cancelled by the same red Albany "Paid" (R. Lowe, Mar. 15, 197, lot 1196).
The cover offered here travelled from New York City north to Albany, then west to Buffalo via Utica, Syracuse and Rochester. This "Pomeroy's Express" marking -- cut down from its earlier circular version -- is found only on covers to and from New York City. The pair was cancelled in transit at Albany, using the "Paid" straightline seen on both other covers. The additional Pomeroy stamp may have been required for weight, or possibly it was applied because the sender thought double postage was necessary for the route to Buffalo (Wells Letter Express advertised a Buffalo-New York City rate of 12-1/2c, or two stamps). (Image)
Pomeroy's Letter Express, 5c
Lake on Thin Bond (117L6). Full to large margins, beautiful rich color
and impression, cancelled by red "Paid" straightline (not tied), used on
Aug. 6, 1844 folded letter from New York City to Albany, fresh and
Extremely Fine, remarkably choice use of the 5c Lake on northbound mail
from New York City (Image) 
Forwarded by Pomeroy & Co.
Express from Albany. Red circular handstamp on Oct. 4, 1843 folded
letter from Albany to Customs House in New York City, addressed in blue,
ms. "Paid", file folds, Very Fine (Image)