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2478b, MNH 3¢ With Double Impression MAJOR ERROR - Stuart Katz

$ 158.4 $ 95.04

1483a, Mint NH Color Shift EFO Error Sheet of 50 Stamps - Stuart Katz

$ 171.6 $ 102.96

1800, 15¢ Two Different Large Color Shift ERRORS Mint NH WoW - Stuart Katz

$ 35.2 $ 21.12

917c 5c Yugoslavia partial reverse MNH (see closeup)

$ 8.58 $ 5.14

US 3054a 32¢ 1997 Rose Missing Die Cut Pair Miscut Design Change EFO

$ 37.4 $ 22.44

US #811 MNH 6c John Quincy Adams, EFO: misperf

$ 1.58 $ 0.95

Stamp Pair 1949 DC-4 Skymaster Airmail #C39a PERFORATION ERROR MNH/OG

$ 5.72 $ 3.43

Sc # 2115C ~ 22 cent Flag Over Capitol Dome Issue (dg15)

$ 1.31 $ 0.78

#3477 34c Statue of Liberty EFO Misperforated Diecut Pair MNH OG VF

$ 7.04 $ 4.22

2256a, Mint VF NH 8.4¢ Wheel Chair Imperforate Pair Error -- Stuart Katz

$ 242 $ 145.19

P860 US stamps Scott ? 8c Extra Red Green Line Errors UNH Nice Coll

$ 4.26 $ 2.56

1430a Double Impression MAJOR ERROR - 8¢ Wildlife - Mint NH - Stuart Katz

$ 1760 $ 1056

1771a Error Imperf Pair VF-XF OG NH SCV. 0 w/ 2 certs (JH 4/4)

$ 464.64 $ 278.78

US. 1771. 15c. Martin Luther King. Portrait Double Transfer. VARIETY. MNH. 1979

$ 2.18 $ 1.3

807, MNH 3¢ Under Inked Error In Complete Sheet of 100 - Stuart Katz

$ 171.6 $ 102.96

US MNH Error Stamp & Normal Stamp Haym Salomom Scott #1561 (Perf Shift)

$ 17.59 $ 10.55

G6/75 US Stamp # 1305e 15c Coil Perf not Through Pair MNHOG Nice Freak Pair Coll

$ 6.15 $ 3.69

#C81 VAR. AVG OG NH Right Margin Horz Pair Misaligned Perfs (JH 6/5/21)GP

$ 83.6 $ 50.16

D0175: US #3981a Mint Strip of 5, ERROR

$ 87.99 $ 52.79

US 1981 20c Pumper Coil Pair - Misperforation Error Scott 1908

$ 7.92 $ 4.75

2441ac, PINK COLOR OMITTED COMPLETE PANE MAJOR ERROR Cat ,250.00+

$ 514.79 $ 308.87

Scott 556 Variety Mint Pair (M. Washington) NH Pre-Printing Paperfold EFO E0

$ 220 $ 132

US #1894c (1981) 20c -MNH-EFO: {99% - Dk Blue Omitted} sheet 100 - Scarce/Rare

$ 99000 $ 59400

EFO 1472 PERF SHIFT CHANGE OF DESIGN BLOCK OF FOUR

$ 39.6 $ 23.76

EFO 2114 MISPERFED PLATE BLK OF FOUR PERFS CUT THRU TOP OF OLD GLORY

$ 19.8 $ 11.88

1519a 10c crossed flags coil strip of 4 IMPERF ERROR 1973

$ 28.16 $ 16.89

1972 Family Planning 8c Stamp #1455 MNH MISPERFORATION ERROR

$ 6.11 $ 3.66

1986 Stamp Pair Cardiologist Paul Dudley White MD 3c #2170 MNH MISPRINTING ERROR

$ 6.11 $ 3.66

US, 1932 Christmas Seal Block, JUMBO Margin, Perf 12 1/2 x 12 3/4, MNH

$ 12.83 $ 7.7

O3/47 US Stamps Christmas Seal 1949 Red Color Shift Error MNHOG Nice Error Coll

$ 2.5 $ 1.5

#2142a Vertical Pair Imperforate Horizontally Error Mint-VF-OG-NH (2/9/21 GP)

$ 211.2 $ 126.71

EFO 1448 BEACH SHIFTED TO RIGHT! COVERS SOME MARGINAL DESCRIPTIVE TEXT

$ 17.6 $ 10.56

1593 .11 Printing Press Mispef Plate Block Of 25 MNH

$ 175.12 $ 105.07

3069a, MNH 32¢ Georgia O'Keefe Complete Imperforate Pane ERROR - Stuart Katz

$ 572 $ 343.2

3412 SPACE ACHIEVEMENT UNIQUE DOUBLE HOLOGRAM ERROR STAMP NH EX. JACQUES SCHIFF

$ 5279.99 $ 3167.99

1281 Nice Two Way Margin Misperf!

$ 12.27 $ 7.36

ATOMIC BOMB ENDS WWII - 1995 U.S. POSTAGE "STAMP" (TYPE 4) - MINT CONDITION

$ 2.59 $ 1.55

R1/55 US stamps Scott ? 6c Per Shift Error UNH Nice Coll

$ 6.02 $ 3.61

#2130B Oil Wagon Imperf Error Stamp #3   MNH OG VF

$ 131.95 $ 79.17

#2280e "FLAG OVER YOSEMITE" PAIR BLACK TREES ERROR BP2560B

$ 107.8 $ 64.67

#1816B IMPERF COIL PAIR BM2530

$ 92.4 $ 55.44

2198-2201b Missing Black 2198,2201. Complete Booklet Of Two Panes. Cat. 0

$ 69.52 $ 41.71

EFO REVENUE R144 LARGE BOTTOM MARGIN CAPTURES PART INSCRIPTION AND PLATE NUMBER

$ 57.2 $ 34.32

United States, 1930 Christmas Seal FREAK, Gray Ooze, Printer E, WX55, MNH

$ 9.31 $ 5.59

3835 Complete Misperforated ERROR Sheet of 20 - 37¢ Dr. Seuss - Stuart Katz

$ 330 $ 198

1610a, Mint VF NH Brown Engraved Color Omitted Error W/Normal -- Stuart Katz

$ 131.95 $ 79.17

1618C Misperf Error / EFO Strip of 3 "Flag" Mint NH

$ 7.64 $ 4.58

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

$ 373.95 $ 224.37

874 John J. Audubon, Scientist. 10 MNH 1¢ plate blocks. Famous American. 1940.

$ 6.6 $ 3.95

1734a - 13c Indian Head Penny Error FULL SHEET of 150 - Imperf Vertically

$ 17160 $ 10296

Scott 424 Variety Mint B6 (Washington) H OG Foldover/Printed on Back EFO E00

$ 682 $ 409.2

1509 Sheet Cross Flags Missing Ornament Top Of Right Pole Position 44

$ 351.12 $ 210.67

2915Ah / Flag over Porch / Strip of 6 Imperf (Die Cutting Omitted) Error / MNH

$ 32.07 $ 19.24

Cinderella S&H Green Stamp Test / Dummy "Sample Only" Strip of 6 Mint NH

$ 6.15 $ 3.69

USA EFO, ERROR Stamps: # 1055, T. Jefferson Misperf & miscut Strip of 5 ! MNH

$ 15.79 $ 9.47

USA EFO, ERROR Stamps: # 1906, Electric Auto Misperf & miscut Strip of 6 ! MNH 1

$ 19.75 $ 11.85

USA EFO, ERROR Stamps: # 1617, Justice Misperf & miscut Strip of 6 ! MNH

$ 22.39 $ 13.43

1610, MNH Flame HUGE Color Shift Error Zip Block WoW - Stuart Katz

$ 132 $ 79.2

US Misperforated 1949a booklet stamp, "Two-nosed Sheep"

$ 4.62 $ 2.77

3263 $.22 Uncle Sam miss perf miss cut Newley Discovered

$ 440 $ 264

Scott 805b Washington Imperf Between ERROR Mint Pair in Block of 6 Stamps NH

$ 61.59 $ 36.95

US, 1945 Christmas Seal, Single, Green's 45-1.1 Error, Black/Red Only, MNH

$ 18.99 $ 11.39

EXTREMELY RARE Wisconsin Salmon & Trout Stamp Block 1992 Error

$ 396 $ 237.6

2721 Var ELVIS PRESLEY MAJOR COLOR SHIFT ERROR BLOCK HV8564A

$ 875.6 $ 525.36

US. 3265a. (33c) Uncle Sam's Hat. Die Cutting Omitted, Pair of 2. MNH. 1998

$ 42.03 $ 25.22

Scott 1409, 6c Fort Snelling, 3 different RED COLOR SHIFTs, used, EFO

$ 3.51 $ 2.1

R1/57 US stamps Scott ? 10c Per Shift Jumbo Error UNH Nice Coll

$ 6.02 $ 3.61

MNH GUTTER SNIPE Block of 4, Scott #1290 25c Douglass/ Pane MIscut Horizontally

$ 42.24 $ 25.34

#C86 VAR. "ELECTRONICS" PLATE # BLOCK OF 4 MAJOR COLOR SHIFT ERROR BS7766

$ 286 $ 171.6

#2235-38 Navajo Art full sheet of 50 MNH perf. shift toning little soft wrinkle

$ 350.24 $ 210.14

EFO 2201b (x2) BOTH ERROR BOOKLET PANES MISSING BLACK INK COMPLETE BOOKLET

$ 88 $ 52.8

TD108 Scarce Carmine Test / Dummy Tagged Line Pair Unused Cat ??? "READ"

$ 1583.99 $ 950.39

EFO 702 FDC WITH THE RED CROSS SHIFTED TO UPPER LEFT CORNER.

$ 22 $ 13.2

US # 136 (1870) 3c,Used - Grade:G, EFO: Split Grill w/3 pts {Very Scarce - Rare}

$ 7920 $ 4752

USA 1968 EFO … Oliver Wendell Holmes Sc.1288  - MISPERF  -  strip of 3  - MNH

$ 3.74 $ 2.24

U646a ENTIRE BLUE GRAY COLORS OMITTED ERROR - Stuart Katz

$ 79.15 $ 47.49

EFO 831 BLOCK OF 8 WITH HORIZONAL MISPERF --SCARCE HIGH-VALUE 50c PREXY!

$ 140.8 $ 84.48

U.S. EFO'S 2492h Mint (ID # 77800)

$ 836 $ 501.6

548 - Beautiful Reverse Offset Error / EFO Image "Pilgrim Tercentenary" MLH

$ 13.19 $ 7.91

1610a, Mint VF NH Brown Engraved Color Omitted Error W/Normal - Stuart Katz

$ 131.95 $ 79.17

2427b, XF NH 25¢ With Red Litho Color Omitted MAJOR ERROR - Stuart Katz

$ 330 $ 198

JQ1- 1c Parcel Post Reverse Offset Error / EFO Used

$ 14.77 $ 8.86

1452, Mint 6¢ Plate Block With A HUGE Color Shift Error - WoW - Stuart Katz

$ 219.12 $ 131.47

S5/33 US Stamps Scott 8c Plate No. Shown On Coil Stamp Error UNH Nice EFO Coll

$ 3.38 $ 2.03

S5/35 US Stamps Scott Perf Shift Error UNH Nice EFO Coll

$ 3.38 $ 2.03

USA, SCOTT # 1304, USED UNCANCELLED COIL WASHINGTON WITH PART PLATE NUMBER SHOWN

$ 1.98 $ 1.18

NobleSpirit {YH} Rare Unissued "Yellow Hat" H Postcard Rate Blk of 12 ,500 CV

$ 15180 $ 9108

EFO 1511 MISPERFED SINGLE

$ 15.4 $ 9.24

#1382 VAR. 6c "FOOTBALL" PLATE BLOCK MAJOR COLOR SHIFT ERROR BU4767

$ 181.72 $ 109.03

#2523b 29c Flag Over Rushmore EFO Imperforated Pair MNH OG VF "Incs New Mount"

$ 12.32 $ 7.39

EFO 1557 MASSIVE COLOR SHIFT -- A CLASSIC BEAUTIFUL MESS! --"0" cent RATE!

$ 83.6 $ 50.16

US, 1917 Christmas Seal, Scott WX19, Plate C, Offset Yellow Sizing, MNH, No Gum

$ 5.79 $ 3.47

EFO 1111 UR PLATE BLOCK4 WITH SO CALLED "MISSING WREATHS" ABOVE RIBBONS

$ 132 $ 79.2

EFO 1413 BLACK INK MISSING CREATES "SI" INSTEAD OF "SIX CENTS" --NO CENTS!

$ 17.6 $ 10.56

1991 TULIP F-rate BK183 Sc 2519a (2) plate # 2222 Dramatic Mis-Cut

$ 28.02 $ 16.81

2967. Huge Color Shift Major ERROR - Marilyn Monroe - Stuart Katz

$ 176 $ 105.6

US Stamps: #530a EFO; 3c Type IV Offset Wash/Franklin; Double Impression; Used

$ 175.99 $ 105.59

EFO 1618a (dull gum var) BROKEN "13" INK STARVATION ALL THREE STAMPS

$ 8.8 $ 5.28

APC / CVP / ATM #CVP108 Full Sheet of 10 USPS Eagle Overprint ERRORS, Flag stamp

$ 30.75 $ 18.45

#1473b "PHARMACY" BLUE COLOR OMITTED MAJOR ERROR XF NH W PFC EXT RARE garyposner

$ 935 $ 561