20c Green (13). Vertical
strip of five with huge right sheet margin and enormous margins
except at top where touching, intense shade and bright fresh paper, tied by
light strikes of "Montgomery Ala." circular datestamp on legal-size cover
to Dadeville Ala., reduced at left to fit album page, minor
edgewearEXTREMELY FINE. THIS IS THE LARGEST RECORDED MULTIPLE OF THE 20-CENT GENERAL ISSUE ON COVER. ONE OF THE MOST IMPORTANT AND SPECTACULAR CONFEDERATE GENERAL ISSUE COVERS IN EXISTENCE.
Ex Knapp (acquired privately by the Halls in April 1928). Unlisted in Scott or Dietz (the latter indicates that a strip of four on cover is the largest multiple). (Image)
20c Green (13). Horizontal
pair, large margins, used with 5c Light Blue, De La Rue (6),
horizontal pair, large margins, both tied by "Wilmington N.C. Jan. 11"
(1864) circular datestamp on legal-size blue cover to Quartermaster at
Raleigh N.C., endorsed "Official Business", handstamped "10", folds and
reduced at top and right, part of backflap removed, left 20c slightly
creasedVERY FINE APPEARANCE. A REMARKABLE COMBINATION OF THE 20-CENT ENGRAVED AND 5-CENT DE LA RUE ISSUES.
We know of no other cover bearing this combination of 20c and 5c De La Rue multiples (Image)
20c Green (13). Large to
ample margins, rich color, tied by double-struck "Adam's Run S.C." circular
datestamp on cover to Dover Mills Va., Very Fine and choice, scarce use of
the 20c (Image) 
20c Green (13). Large
margins to clear at right, tied by "Bristol V.&T.R.R." circular
datestamp on small narrow blue cover to Richmond Va., half of backflap
removed, small toned spot on stamp, otherwise Very Fine, rare railroad use
of the 20c (Image) 
20c Green (13). Large
margins to touched at right, tied by red "Greensborough N.C. May 14"
(1864) circular datestamp on cover to Jackson Miss., stained at lower left,
otherwise Fine, scarce with red cancel
(Image) 
20c Green (13). Large
margins, tied by "Richmond Va. Apr. 28" (1864) circular datestamp on
U.S. 3c Red Star Die entire to Staunton Va., backflap removed, stamp
lifted (color slightly washed out), Very Fine
(Image) 
20c Green (13). Three
large margins, slightly in at right, tied by "Charlottesville Va. May 19,
1864" double-circle datestamp on legal-size buff cover to Big Lick Va.,
turned and re-used with 10c Greenish Blue, Die B (12c), faults, tied
by "Big Lick Va." circular datestamp, another stamp removed from cover,
small part of corner torn off, opened for display, Fine and unusual usage
(Image) 
20c Green, Diagonal Half Used
as 10c (13c). Upper right diagonal half with full margins, tied across
the cut by "San Antonio Tex. Oct. 5" circular datestamp on folded letter
from San Antonio merchant to New Braunfels Tex. re shipment of cognac "by
teamster", file fold with tiny erosion spot, Very Fine, a choice bisect
usage within Texas (Image) 
20c Green, Diagonal Half Used
as 10c (13c). Upper left diagnoal half with large margins, tied across
the cut by "Brownsville Tex. Jan. 10, 1861" (year date error as always)
circular datestamp on yellow cover to San Antonio Tex., small erosion hole
clear of bisect and markings, otherwise Very Fine, scarce usage (Image)