1917 2c deep rose, type Ia, bottom Plate No. single, hinged at lower left, stamp n.h., v.f., cat. $550 (Cat No. 500) (Image)

Cat. $550, Est.$250

1917 5c carmine, single error in strip of three (adjoining stamps are 2c), h.r., fine, cat. $325 (Cat No. 505) (Image)

Cat. $325, Est.$100

1918 $2 orange and black, well centered, vignette slightly shifted to bottom, h.r., v.f., cat. $500 (Cat No. 523) (Image)

Cat. $500, Est.$150

1918 $2 carmine & black, $5 deep green & black, l.h., the latter with tiny internal wrinkle, fine-v.f., cat. $270 (Cat No. 525,547) (Image)

Cat. $270, Est.$150

1918 2c carmine, type VII, h.r., couple of tiny thin spots, still fresh and v.f., rare stamp, with 2007 PSE certificate (graded VG 50) cat. $2000 (Cat No. 534B) (Image)

Cat. $2000, Est.$300

1919 2c carmine rose, type II, barest trace of a hinge, usual centering, with photocopy of a 1989 PSE certificate for a block of four from which this originated, cat. $2700 (Cat No. 539) (Image)

Cat. $2700, Est.$500

1922 Rotary Perf. 11, 1c green, unused without gum, exceptionally well centered, tiny corner perforation crease at lower left, still v.f., with 2009 PFC. It is believed that fewer than 20 exist in any unused state (a small quantity of 1c Rotary Press stamps was perf. 11 at the end of 1922, using remainder sheets from the earlier experimental printings that were normally perforated in 10 gauge or 10/11 compound gauge. Its existence as a perf. 11 variety was discovered in 1936, and the stamp received its Scott's Catalogue listing in 1938. Most of the recorded copies of Scott's 544 are off-center or have been damaged, the result of poor production standards and mishandling) cat. $22500 (Cat No. 544) (Image)

Cat. $22500, Est.$5,000

1922 8c olive green, bottom Plate No. Block of six, l.h., fine-v.f., cat. $575 (Cat No. 560) (Image)

Cat. $575, Est.$150

1922 9c rose, left margin Plate No. Block of six, n.h., v.f., cat. $375 (Cat No. 561) (Image)

Cat. $375, Est.$150

1922 25c deep green and 30c olive brown, top and bottom Plate No. Blocks of six, h.r., some gum skips, fine-v.f., cat. $625 (Cat No. 568,569) (Image)

Cat. $625, Est.$200

1922 50c lilac, top Plate No. Block of six, h.r., fine-v.f., cat. $550 (Cat No. 570) (Image)

Cat. $550, Est.$150

1922 $2 blue, top margin Plate No. Block of six, l.h., well centered, fine-v.f., cat. $700 (Cat No. 572) (Image)

Cat. $700, Est.$250

1922 $5 carmine & blue, top Plate No. Arrow Block of eight, l.h., well centered, diagonal creases, fine-v.f., cat. $2500 (Cat No. 573) (Image)

Cat. $2500, Est.$750

1923 Rotary perf. 11, 1c green, unused part original gum, h.r., natural straight edge at top, thins, otherwise fine and attractive centering for this difficult issue with perfs clear (often found with perfs in), with 1959 PFC and 2010 PSE certificates, One of the rarest 20th Century United States stamps in unused condition (the 1c green, Scott's 594, is waste from a horizontal rotary printing used to make coils. At the beginning or end of a coil-stamp print run from the 170-subject rotary plates, some leading or trailing paper was produced that was too short for rolling into 500-stamp rolls. In 1919 the Bureau devised a plan to salvage this waste by perforating and cutting the sheets into panes. They were put through the 11-gauge flat-plate perforator in use at the time, giving the sheets full perforations on all sides. The existence of Scott's 594 was not reported until four months after the final sheets were delivered, and the 1c Rotary perf. 11 was soon recognized as one of the rarest United States stamps (Scott's Catalogue notes "both unused and used are valued with perforations just touching frameline on one side") cat. $65000 (Cat No. 594) (Image)

Cat. $65000, Est.$15,000

1923 Rotary perf. 11, 2c Harding, top sheet margin single, sharp impression, machine cancel, small faults mentioned on the accompanying 2002 PSE certificate, fine appearance (Warren G. Harding, the 29th President, died in San Francisco on August 2, 1923 and a Harding memorial stamp, printed in black was rushed into production). The first flat plate printing (Scott's 610) was issued on September 1, 1923, in his home town of Marion, Ohio, followed less than two weeks later by the normal perf. 10 rotary press printing (Scott's 612) on September 12. The 2c Harding Rotary perf. 11 stamp was discovered in 1938 by Leslie Lewis of the New York firm, Stanley Gibbons Inc. Gary Griffith presents his hypothesis in United States Stamps 1922-26 that rotary-printed sheets of 400 were first reduced to panes of 100 and then fed through the 11-gauge perforating machine normally used for flat plate sheets. This method explains the existence of a straight-edge on Scott's 613. Production quality and quantity was very low, due to the rotary press stamps' natural tendency to curl, and the use of the flat plate perforator for the slightly different-sized rotary printing. Only 43 used singles, one used pair and a used strip of three are recorded, cat. $40000 (Cat No. 613) (Image)

Cat. $40000, Est.$10,000

1925 13c green, 17c black, left Plate No. Blocks of six, h.r., fine-v.f., cat. $460 (Cat No. 622-23) (Image)

Cat. $460, Est.$150

1928 2c carmine, Type II, l.h., v.f., with 2008 graded (VF-XF 85) PSE certificate, cat. $300 (Cat No. 634A) (Image)

Cat. $300, Est.$200