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#1926a Black Omitted (GP2)

$ 160.16 $ 96.09

294 - Huge Color Shift Error / EFO Pair "Sinking Ship" Pan-American Unused

$ 61.59 $ 36.95

1845 Var, MNH 2c - TAPE SPLICE CREATES DOUBLE PAPER ERROR - Stuart Katz

$ 66 $ 39.6

US,953,DR. GEORGE WASHINGTON CARVER,PARTIALLY IMPERFORATE,MINT NH OG,VF

$ 34.71 $ 20.82

632, Unused 1¢ Under Inked & Misperfed Error Block of 8 Stamps - Stuart Katz

$ 264 $ 158.4

1949a Misperfed Bighorn Sheep Complete Booklet 2 Panes EFO

$ 35.15 $ 21.09

1394 8 Cent US Eisenhower Pair With Maroon Inscription

$ 13.15 $ 7.89

1436a Black and Olive Colors Omitted MAJOR ERROR With Normal - Stuart Katz

$ 396 $ 237.6

3281e 33c Flag over City Small Date Die Cut Omitted Error Pair

$ 197.95 $ 118.77

702 2¢ Red Cross shift up MNH

$ 1.66 $ 0.99

1866, MNH 37¢ Heavy Ink Smear Error in Block of 30 Stamps - Stuart Katz

$ 110 $ 66

US Sc 2592, 2842 used. 1994 Washington & Jackson, .95 Moon Landing, F-VF.

$ 14.93 $ 8.96

scott 3466 stature of liberty — MISPERFED strip of 5

$ 4.39 $ 2.63

CVP-88x2 ~ CVP-91x2 Stamp ERRORS - You Pick, Your Choice

$ 44 $ 26.4

C115, MNH 44¢ Tape Splice Error Sheet of 50 Airmail Stamps - Stuart Katz

$ 435.6 $ 261.36

EFO C80 GHOST PRINTING CREATES DOUBLE "USA" AND "17c" VALUE -- STRIKING

$ 26.4 $ 15.83

2764b, Mint NH 29c Flowers - Misperforation Error Booklet Pane - Stuart Katz

$ 28.99 $ 17.39

C64, MNH 8¢ Misperfed Full Sheet of 100 Airmail Error Stamps - Stuart Katz

$ 171.6 $ 102.96

U.S. #2466a Mint NH - 1995 32c Ferryboat, Imperf Pair

$ 242 $ 145.19

525 radical misperf error block of 4 issued in 1918 offset printing

$ 57.2 $ 34.32

#2635a Black (Engr.) Omitted Error Mint-Fine-OG-NH SCV 5 (2/9/21 GP)

$ 338.8 $ 203.28

2013, MNH 20¢ Misperfed Error In Sheet of 50 Stamps - Stuart Katz

$ 83.6 $ 50.16

950 - Miscut Gutter Snipe Error / EFO "Utah Centennial" Pioneers Mint NH

$ 4.39 $ 2.63

1435a, Black Color Shift Error 8¢ Space Stamps Mint NH - Stuart Katz

$ 13.2 $ 7.91

Scott 1590 - MISCUT double with LINE and partial plate number MNH

$ 4.22 $ 2.53

U.S. SC. #1555- 10c D.W. GRIFFITH WITH NEAT COLOR SHIFT-BLOCK OF 6-MNH-LOOK!

$ 13.15 $ 7.89

1283, MNH 5¢ Misperforated Full Sheet of 100 Stamps Error Stuart Katz

$ 198 $ 118.8

554, Mint NH 2¢ RARE Misperfed Error Block of 18 Stamps - Stuart Katz

$ 198 $ 118.8

1979 Skylab First Day Issue Envelope US Postal ERROR 2 Different Stamped Dates

$ 51.92 $ 31.15

U.S. Scott #C98A Phillip Mazzei 40c Airmail - Red + Yellow Color Shift Misprint

$ 87.99 $ 52.79

C80, MNH 17¢ Reverse Printing Under Gum Error Sheet - Stuart Katz

$ 523.6 $ 314.16

2276, 22¢ MNH Large Red Tape Splice Error Sheet of 100 Stamps - Stuart Katz

$ 435.6 $ 261.36

P161 US Stamp RB20p/ RP23 1/8c / 5/8c MNHOG Great Mint Coll

$ 7.81 $ 4.68

US Sc 3472-3473 used. 2001 .50 Priority, .25 Express Mail issues, fresh, VF

$ 14.05 $ 8.43

EFO #1204 Dag Hammarskjold 4¢ Color Shift

$ 4.39 $ 2.63

1556, Mint NH 10¢ HUGE Color Shift Space Stamp WoW - Stuart Katz

$ 110 $ 66

#1478 Postrider FDC cancel, with cachet and green color 1 mm offset

$ 0.69 $ 0.41

United States Postage Stamp #2482a Mint No Gum Black Omitted

$ 99 $ 59.4

2079a, MNH 20¢ Orchids Misperfed Error In Sheet of 48 Stamps - Stuart Katz

$ 110 $ 66

1919a, MNH Scarce Miscut Error 18¢ Space Sheet Shows Gutter at Top- Stuart Katz

$ 110 $ 66

1384 Var, Baltimore, MD Shifted Pre Cancel Plate Block of Ten Error Stuart Katz

$ 396 $ 237.6

US SCOTT #2134a IMPERF COIL PAIR MINT NH ERROR SCV (9/3/21 GP)

$ 52.8 $ 31.67

CE2, Mint NH 16¢ Blue Eagle Shifted Well Up Color Shift Error -*- Stuart Katz

$ 110 $ 66

1444 - 8c Ink Streak Error / EFO Pair "National Gallery of Art" Mint NH

$ 5.27 $ 3.16

Scott 1743 - MISCUT strip of 6 with LINE and partial plate number MNH

$ 11.26 $ 6.75

Scott 686 - MISCUT strip of 2 with LINE and partial plate number MNH

$ 11.26 $ 6.75

Scott 849 - MISCUT strip of 2 with LINE and partial plate number MNH

$ 8.62 $ 5.17

SCOTT 1057, 3c LIBERTY, MISCUT double partial plate number MNH

$ 1.32 $ 0.79

3413b, Double Hologram RARE MAJOR ERROR Just 3 Known to Exist! - Stuart Katz

$ 3520 $ 2112

#1787a 15¢ "SEEING EYE DOG" IMPERF PAIR MAJOR ERROR BQ5252

$ 286 $ 171.6

1118, MNH 8¢ Tremendous Color Shift And Misperf Error - Stuart Katz

$ 44 $ 26.4

Error Sheet Stamp # 1394 1971 8c Eisenhower 100 Stamps (stamps printed on back)

$ 118.8 $ 71.28

#2551a Vertical Pair Imperforate Horizontally Error Mint-XF-OG-NH (2/9/21 GP)

$ 396 $ 237.6

Scott 842 - MISCUT strip of 2 with LINE and partial plate number MNH

$ 4.22 $ 2.53

Scott 1059a - MISCUT strip of 2 with LINE and partial plate number MNH

$ 5.98 $ 3.59

1312, Mint NH 5¢ Scarce Misperfed Error Pair Bill of Rights - Stuart Katz

$ 26.35 $ 15.81

1230, Mint NH 5¢ Scarce Misperfed Error Carolina Charter - Stuart Katz

$ 26.35 $ 15.81

1142, MNH 4¢ Great Misperfed Error Francis Scott Key - Stuart Katz

$ 13.2 $ 7.91

1488, Mint NH 8¢ Misperfed Error Mail Early Block of Six Stamps - Stuart Katz

$ 66 $ 39.6

1104, 3c BRUSSELS - MISPERFORATED ERROR SHEET OF 50 - VERY RARE! - Stuart Katz

$ 435.6 $ 261.36

1711, Mint NH 13¢ Misperfed Error (Misplaced Pins) Block - Stuart Katz

$ 83.6 $ 50.16

2005a IMPERF ERROR PAIR OF 2 STAMPS NH (Stock BX 1046)

$ 43.99 $ 26.39

US Sc 1909, 2122 used. 1983 .35 & 1985 .75 Eagle and Moon Express Mail, VF

$ 20.02 $ 12.01

1778a, Mint NH 15¢ Color Shift Error PL# Block of 12 Stamps - Stuart Katz

$ 66 $ 39.6

1759, Mint NH 15¢ Large Perf Shift Error Margin Pair Space Stamps - Stuart Katz

$ 66 $ 39.6

1280, Huge Misperf Error 2¢ Frank Lloyd Wright Stamp Mint NH - Stuart Katz

$ 5.23 $ 3.14

United States Postage Stamp #2479 MNH MAJOR COLIR SHIFT ERROR

$ 23.1 $ 13.86

1593 - 11c Misperf Error / EFO "Printing Press" Mint NH (Stk1)

$ 7.91 $ 4.74

1947, 20¢ "C" Misperfed Error Coil Strip Of Four Stamps + Stuart Katz

$ 26.4 $ 15.83

2012 Waves ( NICELY MOUNTED ) MNH ( Ships with Tracking )

$ 28.16 $ 16.89

1894, MNH 20¢ Partial Red Color Missing With Normal - Stuart Katz

$ 26.35 $ 15.81

913a, VF OG NH - Reverse Printing of Flag Colors - Stuart Katz

$ 83.6 $ 50.16

#1897Ac "LOCOMOTIVE" IMPERF COIL PAIR MAJOR ERROR -- NH -- BU3544

$ 22 $ 13.2

Scott 839 - MISCUT strip of 5 with LINE and partial plate number MNH

$ 11.26 $ 6.75

Scott 1402 - MISCUT strip of 6 with LINE and partial plate number MNH

$ 11.26 $ 6.75

US Scott #1844a imperf pair Mint NH OG Very Fine SCV 0 PFC Cert

$ 176 $ 105.6

US Scott C82a Imperforate strip with line Mint NH OG Superb SCV 5

$ 594 $ 356.4

1778a, MNH 15¢ Scarce Misperforated Error Sheet of 40 Stamps - Stuart Katz

$ 132 $ 79.2

2037, Mint NH 20¢ Looks Like Imperforate Error Pair (Blind perfs) - Stuart Katz

$ 66 $ 39.6

4133a (41c) American Flag Die-cut Omitted Error Pair CV 1,250.00 # 3

$ 417.95 $ 250.77

1945a, RARE Misperf Error 20¢ Cactus Stamps Mint NH -- Stuart Katz

$ 30.8 $ 18.48

USA #1547b XF/NH Orange & Green Omitted Variety **With Certificate**

$ 254.32 $ 152.59

#720 VAR. BLIND PERFS shifted ERROR PAIR GEORGE WASHINGTON Mint Hinged OG

$ 87.99 $ 52.79

1474 - 8c Color Shift Error / EFO Stamp on Stamp "Stamp Collecting" MNH

$ 5.27 $ 3.16

#1474A 80-100 Known Black Litho Omitted (GP2)

$ 261.8 $ 157.08

Scott 1305 - MISCUT strip of 6 with LINE and partial plate number MNH

$ 11.26 $ 6.75

Scott 842 - MISCUT strip of 5 with LINE and partial plate number MNH

$ 11.26 $ 6.75

Scott 599 - MISCUT strip of 2 with LINE and partial plate number MNH

$ 11.26 $ 6.75

300, Mint H 1¢ Franklin RARE Misperf Error Block of Six Stamps - Stuart Katz

$ 110 $ 66

1990, DEFINITIVE ISSUE, BOBCAT MULTI, LEFT MARGIN SINGLE, SCOTT #2482a, MNH

$ 88 $ 52.8

1035 - Misperf Error / EFO COD Pair "Change of Design" "Statue of Liberty" "Read

$ 7.73 $ 4.64

640, Mint OG 8¢ RARE Printers Waste Stamp - Stuart Katz

$ 22 $ 13.2

1555 Huge Multiple Color Shift Error / EFO "D. W. Griffith" Mint NH

$ 13.01 $ 7.8

1042, Mint LH 8¢ Liberty Misperf Error Block of Four Stamps - Stuart Katz

$ 70.4 $ 42.24

1973 Robert Indiana LOVE Multiple Color Frame Shift Errors EFO Stamp MINT! #1475

$ 3.51 $ 2.1

810, MNH 5¢ Large Gutter Snipe Error Block of Ten - Stuart Katz

$ 66 $ 39.6

1042, Mint NH 8¢ Misperforation Error Block of Four - Liberty - Stuart Katz

$ 26.4 $ 15.83

1431, Unused 8¢ Diagonal Misperforation Error Block of Six - Stuart Katz

$ 52.75 $ 31.65

499, Mint 2¢ Large RARE Misperf Error Plate Block of Eight Stamps - Stuart Katz

$ 171.6 $ 102.96

938, 3¢ TEXAS RARE Misperf Error Mint NH - Stuart Katz

$ 21.95 $ 13.17