12c Black, Plate 3 (36b).
Horizontal pair, s.e. at left, tied by large Boston "Paid" grids, red
"Boston Br. Pkt. 7 Paid Jun. 4" credit datestamp on red and blue "Stand
by the Flag" Patriotic cover to Antwerp, Belgium and redirected to
Frankfort, Germany, 1861 usage, embossed grocer's return card at top,
small boxed "PD" handstamp, Ostende and Anvers backstamps, blue ms.
ratingVERY FINE. A RARE "ANGELL" PATRIOTIC COVER WITH THE 12-CENT 1857 ISSUE, ADDRESSED TO BELGIUM AND FORWARDED TO GERMANY.
A review of the Matthies holding of Angell patriotics found only three covers bearing stamps solely from the 1857 Issue. In addition, this is the only cover addressed to either Belgium or Frankfort.
Ex Matthies. (Image)
12c Black (69). Used with
horizontal pair and single of 3c Rose (65), tied by targets and "New
Orleans La. Feb. 17, 1865" double-circle datestamp on orange cover to
Mons, Belgium, red "New York Paid 18 Feb. 28" credit datestamp, red
boxed "P.D.", appropriate transits, minor edgewear, Fine usage to Belgium
(Image) 
24c Red Lilac (70).
Radiant color, used with 3c Rose (65) and cancelled by bold grids, tied by
red "New-Haven Ct. Oct. 25" double-circle datestamp on 1864 cover to
Brussells, Belgium, red "Boston Br. Pkt. 7 Paid Oct. 26" credit
datestamp, Ostende and receiving backstamps, some slight wear incl. part of
address scratched out, otherwise Fine
(Image) 
BELGIUM, 1858-61, 20c Blue,
40c Vermilion (11, 12). Vertical strip of three of 40c, large margins
to cut into, tied by bold strikes of "4" in grid cancels, "Anvers 30-7
1861" circular datestamp on red and blue Standing Liberty and Flag with
"Union Forever" Slogan Patriotic cover to New York, red "N. York Am.
Pkt. 27 Paid Aug. 14" credit datestamp, clear "Am. Pkt." backstamp, missing
backflap, few minor cover repairsFINE APPEARANCE. A RARE USAGE OF A PATRIOTIC COVER FROM BELGIUM TO NEW YORK.
Perhaps four or five patriotics exist used from Belgium, but no others are known with this franking.
Ex Matthies. (Image)
Anvers 4-s -7. Clear
circular datestamp with small "PD" handstamp on cover to Boston Mass. with
hand-drawn multicolored Union Flag Patriotic design, endorsed
"Via Ostende" and "per Steamer from Queenstown", ms. "20"
rate at top left, blue "August Andre Ship Broker Antwerp" and 1861
backstamp, Very Fine, scarce hand-painted patriotic from Belgium, reported
to be one of four extant (Image) 
BELGIUM, 1858-61, 20c Blue,
40c Vermilion (11, 12). Large margins to just in, radiant color, tied
by bold "4" in grid cancels, "Anvers 15-3 1861" circular datestamp on blue
folded letter to New York, 20c also tied by well-struck red "N. York Br.
Pkt. 27 Paid Mar. 31" credit datestamp, faint horizontal file fold does not
affect stamps, fresh and Very Fine (Image)