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1414b, VF NH 6¢ Black Color Omitted Error With With Normal - Stuart Katz

$ 286 $ 171.6

909c 5c Poland reverse printing MNH (see closeup)

$ 6.99 $ 4.19

US #2088 20c BLOCK OF 20. D. FAIRBANKS MNH,1984 Error no perforation top right

$ 5.98 $ 3.59

#1823 Emily Bissell 15c, MASSIVE Single Imperforate Horizontal Top/Bottom w/Void

$ 528 $ 316.8

US 10 CENT JEFFERSON MEMORIAL IMPERF STRIP OF 5 WITH LINE, USED

$ 88 $ 52.8

1-US Stamp Used #1106 3 cent Minnesota Statehood 1958 EFO. Miscut. Misperf.

$ 4.4 $ 2.64

RB18b 6c proprietary, crazy perfs, vf mng, cv 35.+

$ 11.43 $ 6.85

US Sc 2544A used. .75 Space Shuttle Endeavor Express Mail, SON cancel, F-VF.

$ 12.32 $ 7.39

US Sc 2544A used. .75 Space Shuttle Endeavor Express Mail, SON cancel, VF.

$ 14.93 $ 8.96

RW53a, Mint XF NH Black Color Omitted Error With Normal - Stuart Katz

$ 1100 $ 660

#5052 VAR. "FLAG" ISSUE IMPERF PAIR DIE CUTTING OMITTED ERROR BT6686

$ 351.12 $ 210.67

2529a - Scarce PNC5 Pl# A7767 Multiple Imperf EFO (PW) Fishing Boat MNH "Read"

$ 307.99 $ 184.79

US #1622, 1625, 13¢ Flag Over Independence Hall, Group of 3 Freaks, og, NH, VF

$ 25.52 $ 15.31

2005 .20 Consumer Education Pair MNH

$ 30.8 $ 18.48

6c Flag Coil Pseudo Joint Line Pair 2 Color Pooling Blotch Error Stamps #1338A

$ 6.67 $ 4

10c Flags Coil Pseudo Joint Line Pair Red Color Pooling Error Stamps MINT! #1519

$ 6.67 $ 4

US Stamp 1384m Inverted Baltimore Precancel Error EFO NH cv 0.00 B717 1

$ 69.95 $ 41.97

#702 VAR (2) BLOCKS OF 4 "RED CROSS" VIGNETTE SHIFT ERROR USED & MINT BT1307

$ 49.28 $ 29.56

1336, 5¢ Christmas Color Shift ERROR With Normal Mint NH WoW - Stuart Katz

$ 26.4 $ 15.83

1895, Mint NH Large Miscut Error Coil Pair - Stuart Katz

$ 35.2 $ 21.12

#1055 2c Jefferson - ERROR - EFO - Misperf coil pair in MNH-OG

$ 13.2 $ 7.91

634d, Mint XF NH 98% Of Plate Number Captured Error - Stuart Katz

$ 26.35 $ 15.81

#1618 13c Liberty Bell EFO Misperforated Coil Pair Shiny Gum MNH OG VF

$ 8.8 $ 5.28

(1014) ERROR - Scott #1281, Certical imperf pair, MNHVF

$ 14.52 $ 8.71

810 - 5c Scarce 2-Way Misperf & Precancel Shift Error / EFO Prexie "Monroe" MNH

$ 24.63 $ 14.77

US #2169 EFO 2c Mary Lyon Sheet. *Under Inking* F-VF MNH

$ 272.8 $ 163.68

1299 1¢ Jefferson coil misperf MNH

$ 1.75 $ 1.05

1280a Frank Lloyd Wright Booklet Pane With 100% Plate Number

$ 30.75 $ 18.45

US Sc 2540,2541,2543,2544,2544b,2592 used. 1991-94 High Values, 6 different F-VF

$ 17.57 $ 10.54

C81, Mint NH Reverse Printing Under Gum Error - Stuart Katz

$ 35.2 $ 21.12

5036, Imperforate Plate Block of Six ERROR PFC Cert Mint VF NH Stuart Katz

$ 259.6 $ 155.76

CKStamps: US Error EFO Freaky Stamps Collection Scott#119 Used Shift

$ 0 $ 0

CKStamps: US Error EFO Freaky Stamps Collection Used Misperf

$ 0 $ 0

CKStamps: US Error EFO Freaky Stamps Collection Scott#98 Used Misperf Crease

$ 0 $ 0

SCOTT#3477, 34c STATUE OF LIBERTY, MISPERF, PNC7, PLT.#5555

$ 2.86 $ 1.71

US EFO, ERROR Stamps: #3829A Egret Bird. PS8 #P11111 "Bullet Hole" variety. MNH

$ 13.64 $ 8.18

US EFO, ERROR Stamps: #3550 Flag. "911" perfin! PS5 #1111, PNC. MNH

$ 8.79 $ 5.27

US ERROR Stamps: #2279a Earth Space. Imperf & var. PS7 #1111 PNC MNH 5.+

$ 201.52 $ 120.91

US EFO, ERROR Stamps: #2606 Chrome USA. Color shift PS5, #A1111 PNC MNH

$ 8.79 $ 5.27

US EFO, ERROR Stamps: #2602 Eagle Bird. PS5, #A12213 "blue dot" var. PNC MNH

$ 8.79 $ 5.27

US EFO, ERROR Stamps: #3477 Liberty. Die cut shift PS7, #4444 PNC MNH

$ 8.79 $ 5.27

US EFO, ERROR Stamps: #3044 Kestrel Bird. PS3 X2 Plate varieties. #1111 BYCM MNH

$ 8.79 $ 5.27

US EFO, ERROR Stamps: #3477 Liberty. "911" perfin! PS5 #3333, PNC. MNH

$ 8.79 $ 5.27

US EFO, ERROR Stamps:#3617 Washington. PS5 #V36 Die cut shift & Bell diecuts MNH

$ 8.79 $ 5.27

1381 - 6c Baseball Doubling / Ghosting Error / EFO of Black Error Block of 4 MNH

$ 17.59 $ 10.55

C54 - Scarce 2Way Error / EFO Misperf "Missing Airmail" "Hot Air Ballooning" MNH

$ 24.63 $ 14.77

2841 - Scarce Color Shift Error / EFO "First Moon Landing 1969" 25th Anniv. MNH

$ 43.99 $ 26.39

2251 - Scarce Multiple Error / EFO Overinked & Tag Shift Blk4 Girl Scouts MNH

$ 202.39 $ 121.43

C76 Var, Red Shoulder Patch Missing on 2 Stamps In Full Pane - Stuart Katz

$ 347.6 $ 208.56

C90, Scarce Misperfed Error Airmail Stamp Shows Gutter MNH - Stuart Katz

$ 35.2 $ 21.12

C85, 11¢ Two Way Misperfed Error Airmail With Normal Mint NH - Stuart Katz

$ 35.2 $ 21.12

C63, Mint NH 15¢ Airmail Misperf Error Top Margin Block of Four - Stuart Katz

$ 66 $ 39.6

Nystamps US Stamp # 227 Mint OG 5 Double Transfer g7xx

$ 13.64 $ 8.18

C119, 36¢ Color Shifted Well Up Airmail Error Mint NH - Stuart Katz

$ 22 $ 13.2

C76 Var, Red Shoulder Patch Missing Error - Mint NH With Normal - Stuart Katz

$ 171.6 $ 102.96

C98, 40¢ Multiple Colors Shifted Error Airmail Stamp Mint NH - Stuart Katz

$ 14.91 $ 8.94

C25, 6¢ Over & Underinked Error Airmail Stamps Mint NH - Stuart Katz

$ 13.15 $ 7.89

1312 5 Cent Bill of Rights Misperf

$ 7.87 $ 4.72

US 1551 Christmas Currier & Ives 10¢ MNH mint plate block EFO Yellow Color Shift

$ 7.03 $ 4.21

Set of 4 EFOs MNH Mint NH EFO color shift, doubled image

$ 2.63 $ 1.57

2980 Great Color Shift Plate Block!

$ 28.6 $ 17.16

1615Cd MNH 8.4c Precancelation printing ERROR OKLAHOMA CITY

$ 1.75 $ 1.05

US ALBINO COVER, TYPE SCOTT# U93, MINT, ENTIRE

$ 0.13 $ 0.07

C76, MNH 10¢ MASSIVE Color Shift Error Moon Landing Stamp - Stuart Katz

$ 66 $ 39.6

1237, Mint NH 5¢ Large Perf Shift Error - The Sciences - Stuart Katz

$ 26.35 $ 15.81

NobleSpirit NO RESERVE Exciting DRAMATIC Mortgage MIS-PERF ERROR!

$ 11 $ 6.6

946 - Scarce Misperf Error / EFO "Joseph Pulitzer" Mint NH

$ 13.19 $ 7.91

1912-15, MNH Strip - Misperforated Error Shows Gutter at Left NO RESERVE!

$ 11.44 $ 6.86

1548 - Color Shift Error / EFO Makes "The Legend Of Sleepy Hollow" Underlined NH

$ 10.55 $ 6.33

1892-3 MNH Booklet Imperf Between

$ 22.88 $ 13.72

2063 - 20c Misperf Error / EFO "Change of Design" Mint NH

$ 7.91 $ 4.74

998 Confederate Veterans LH Misperf Pair

$ 4.61 $ 2.76

C98, Color Shift Philip Mazzei Plate Block of 12 40 Cent Airmail Postage Stamps

$ 396 $ 237.6

ST.LUCIA #J2 & BERMUDA #81, T IN CIRCLE. BEAUTIFUL RARE INTER-ISLAND COVER.

$ 35.15 $ 21.09

2085a, MNH 20¢ Misperf Error In Block of 30 Stamps - Stuart Katz

$ 26.4 $ 15.83

1299 MAJOR PERFORATION ERROR IN COIL PAIR, NICE ERROR STAMP!!

$ 2.1 $ 1.26

1356, 6¢ Large Green Color Shift Error Mint NH With Normal - Stuart Katz

$ 17.55 $ 10.53

1547c, Green Omitted Error On Commemorative USPS Panel RARE! - Stuart Katz

$ 171.6 $ 102.96

US Scott #554 Mint-Hinged With Some Creasing as Well, OFFSET ON SELVAGE ERROR SK

$ 21.99 $ 13.19

2126a - 6c Scarce Misperf Error / EFO "Tricycle" Mint NH

$ 7.03 $ 4.21

C54 - Scarce 2Way Error / EFO Misperf "Missing Airmail" "Hot Air Ballooning" MNH

$ 24.63 $ 14.77

E19 - Scarce 20c Misperf Error / EFO Special Delivery "Post Office Truck" MNH

$ 19.35 $ 11.61

807a Rare Miscut Pl# 22171@ Right Booklet Pane W/ 3mm Spacing Mint NH

$ 52.79 $ 31.67

2841 - Scarce Color Shift Error / EFO "First Moon Landing 1969" 25th Anniv. MNH

$ 35.19 $ 21.11

5399-5400 - Scarce Color Shift Error / EFO "First Moon Landing" 50th Anniv. MNH

$ 11.43 $ 6.85

267, Mint H RARE Double Perf Error PL# Strip of 3 - Stuart Katz

$ 110 $ 66

1455 - 8c Huge Color Shift Error Change of Design "Family Planning" Mint NH

$ 6.15 $ 3.69

C98a 40c Color Shift Error / EFO Perf 10.5 x 11.25 "Philip Mazzei" Mint NH

$ 15.83 $ 9.49

C76, MNH 10¢ MASSIVE Color Shift Error Moon Landing Stamp - Stuart Katz

$ 66 $ 39.6

C127, Mint NH 45¢ Misperfed Error Block of Four Airmail Stamps - Stuart Katz

$ 83.6 $ 50.16

C76 Var, Red Shoulder Patch Missing Error - Mint NH With Normal - Stuart Katz

$ 171.6 $ 102.96

C98, 40¢ Two Mazzei Amazing Color Shift ERRORS Mint NH - Stuart Katz

$ 52.75 $ 31.65

C70, MNH 8¢ Two Pre Printing Paper Folds in PB of 9 Airmail Stamps - Stuart Katz

$ 83.6 $ 50.16

C119, 36¢ Color Shifted Well Up Airmail Error Mint NH - Stuart Katz

$ 22 $ 13.2

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

$ 171.6 $ 102.96

C67a, MNH 6¢ Scarce Tagged Error Sheet of 100 Stamps CV 0 - Stuart Katz

$ 242 $ 145.19

C76 Var, Red Shoulder Patch Missing on 2 Stamps In Full Pane - Stuart Katz

$ 347.6 $ 208.56

C32, Mint NH 5¢ Large Misperf Error Airmail Stamp! - Stuart Katz

$ 22 $ 13.2

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

$ 523.6 $ 314.16

C94a, MNH 21¢ Color Shift Sheet of 100 Airmail Error Stamps - Stuart Katz

$ 435.6 $ 261.36