United States

C125b, Mint VF NH Light Blue Color Omitted Error APS Cert - Stuart Katz

$446.50

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QE2a Mint NH VF Plate Block of Six - Dry Printing CV $135.00 Stuart Katz

$75.00

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3830De 37¢ Egret "USPS" Microprinted on Bird's Breast Cat $110.00 - Stuart Katz

Custom Sku: SK-07708

$45.00

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622-23, Two VF NH Plate Blocks of Six BEAUTIES! Cat $625.00 - Stuart Katz

$450.00

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1285, Large Misperforation ERROR Block of 8¢ Einstein Stamps - Stuart Katz

$46.95

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RW30, Mint XF NH DUCK Plate Block of Four Cat $450.00 - Stuart Katz

$275.00

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1205, Large Misperforation Scarce ERROR Block of 4¢ Stamps MNH - Stuart Katz

$70.50

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1591, MNH 9¢ U.S. Capital Misperforation ERROR Strip of 3 Stamps - Stuart Katz

$14.10

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1382, 6¢ Mint NH Large Color Shift Error Football Stamp - Stuart Katz

$23.45

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2075, RARE ERROR Sheet of 50 20¢ Stamps Credit Union Mint NH - Stuart Katz

$470.00

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C116 Complete Sheet of 50 FR. Junipero Serra 44 Cent Airmail Stamp - Stuart Katz

Custom Sku: c116

$69.95

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2979, 32¢ Carousel Horses Complete Sheet of 20 Stamps - Stuart Katz

Custom Sku: SK-16993

$11.95

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426, Mint NH Plate Block With "PINK" Aniline Back VERY RARE! - Stuart Katz

$400.00

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2579a Var SHEET OF 50 - IMPERF PAIRS & DOUBLE PERF ERROR Cat $4,375.00+

$1,645.00

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All Over Back Gold Medal Flour Advertising Cover With Enclosure - Stuart Katz

$14.00

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The Plumbers Trade Journal 1904 Advertising Cover - Stuart Katz

$6.00

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1930 Gray Horse, OKLA RARE Horse Fancy Cancel Registered Cover -- Stuart Katz

$487.50

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559, Mint XF/Superb NH 7¢ JUMBO - Well Centered Stamp! - Stuart Katz

$75.00

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General Upholsterers ALL OVER 3/15/1922 Advertising Cover - Stuart Katz

$9.00

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C5, Mint H/NH VF/XF Block of Four Airmail Stamps Cat $360.00 - Stuart Katz

$225.00

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OK Brand of Beans 1893 Rochester, NY Advertising Cover - Stuart Katz

$9.00

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Coe Electrical Contracting All Over Yellow 1932 Advertising Cover - Stuart Katz

$11.00

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567, RARE XF 20¢ "Worden" Wash, DC First Day Cover Cat $600.00 - Stuart Katz

$350.00

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All Over J.A. Fay & Co Patent Woodworking Machines Advertising Cover Stuart Katz

$14.00

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Meyer's Iron Frame Piano Advertising Cover - Stuart Katz

$14.00

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2114, RARE Misperforation Error P.B. With Gutter! Mint NH - Stuart Katz

$70.50

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C92a, 31¢ Large Color Shift Error Makes For Doubling Of Design - Stuart Katz

$46.95

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298, Used XF 8¢ Panama Canal Stamp GEM QUALITY - Stuart Katz

$75.00

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1731c, MNH With All Colors Omitted Major Error In Pair - Stuart Katz

$705.00

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2062b, Mint NH Black Color Omitted Error Plate Block With Normal - Stuart Katz

$329.00

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441, Mint Superb NH 1¢ Nicely Centered Coil Pair - Stuart Katz

$150.00

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483, Mint Superb OG NH Plate Block of Six Stamps Cat $200.00 - Stuart Katz

$169.00

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390, Mint VF NH 1¢ Coil Line Pair Cat $72.50 - Stuart Katz

$40.00

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149, Used 7¢ XF GEM With JUMBO Margins Stunning Stamp! - Stuart Katz

$140.00

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152, Used 15¢ VF Very Light Cancel Well Centered Cat $210.00 - Stuart Katz

$190.00

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1304, Mint NH 5c Pair - RARE MISCUT & MISPERFORATION ERROR - Stuart Katz

$47.00

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C81, 21¢ Airmail With Tagging Shift Error Looks Like 2X Impression - Stuart Katz

$70.50

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1735, Major Fold Over ERROR Plate Block of Nine 15¢ Stamps MNH - Stuart Katz

$305.50

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RW55, Snow Goose Federal Duck Stamp VF OG NH - Stuart Katz

Custom Sku: rw55

$12.50

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1307, RARE Reverse Printing Under Gum ERROR Complete Sheet of 50 - Stuart Katz

$282.00

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C57, RARE Misperfed ERROR In Complete Sheet of 50 Stamps - Stuart Katz

$235.00

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444, Used 2¢ Washington VF Quality Coil Stamp - Stuart Katz

$30.00

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C81, RARE Reverse Printing Under Gum ERROR Plate Block Mint NH - Stuart Katz

$70.50

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1238, Blue Color Missing From Stamp ERROR - VERY RARE! Mint NH - Stuart Katz

$705.00

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583, MNH 2¢ Perforation 10 Plate Block Of Four Stamps Cat $110.00 -- Stuart Katz

$40.00

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566, Mint 15¢ VF NH Liberty Block of Six Stamps Cat $210.00 - Stuart Katz

$75.00

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2897, 32¢ Complete Sheet of 100 Stamps Brookman $115.00 - Stuart Katz

Custom Sku: SK-14752

$59.95

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White House Tea & Coffee Double Sided Advertising Cover - Stuart Katz

$13.00

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151, Used 12¢ - Lightly Cancelled Cat $210.00 -- Stuart Katz

$50.00

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RK28, $2 Consular Service Revenue Stamp Cat $125.00 - Stuart Katz

$85.00

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RK9, 50¢ Consular Service Revenue Stamp Cat $150.00 - Stuart Katz

$85.00

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1459a, Mint NH With Reverse Printing Under Gum ERROR WoW - Stuart Katz

$235.00

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RW34, Mint XF NH Plate Block Old Squaws Federal Duck Stamp - Stuart Katz

$375.00

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1732, 13¢ Misperfed ERROR Plate Block of 10 Stamps Captain Cook MNH Stuart Katz

$136.30

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532, Superb NH 2¢ Left Side Plate Block of Six Stamps - Stuart Katz

$500.00

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2169, Major Fold Over ERROR Sheet of 100 2¢ Stamps WoW - Stuart Katz

$141.00

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RW81A, Canvasback Federal Duck Stamp Self-Adhesive Pane - Stuart Katz

Custom Sku: rw81a

$44.95

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702, Red Cross is Shifted Far to the Right Block With Normal - Stuart Katz

$188.00

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RW72A, $15 Hooded Manganser DUCK Stamp Self-Adhesive Pane - - Stuart Katz

Custom Sku: rw72a

$32.95

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1690, Reverse Printing Under Gum ERROR Plate Block Mint NH - Stuart Katz

$47.00

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677, Mint XF NH Plate Block 8¢ Nebraska Cat $550.00 - Stuart Katz

$450.00

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117, Used 12¢ Red and Black Color Cancels Cat $270.00 - Stuart Katz

$99.00

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RW21, Artist Signed Harvey Sandstrom (deceased) Duck Stamp VF NH - Stuart Katz

$225.00

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RW71, $15.00 Redheads Duck Stamp VF NH - Stuart Katz

Custom Sku: rw71

$24.95

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266-67, Mint F/VF NH Type II & III Combination Strip Cat $752.00 -- Stuart Katz

$350.00

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2540, $2.90 Priority Mail Misperforation Shift ERROR Plate Block -- Stuart Katz

$282.00

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2590, Large Misperforated ERROR $1 Saratoga Plate Block MNH - Stuart Katz

$164.50

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RW82A, 2016 Ruddy Duck Stamp Self-Adhesive Pane - Stuart Katz

Custom Sku: rw82a

$64.95

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2590, Large Misperforated ERROR $1 Saratoga Plate Block MNH -- Stuart Katz

$164.50

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1015, Scarce Misperforated ERROR Block of Six Stamps Mint NH - Stuart Katz

$51.70

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4439, MNH VF Sheet $18.30 Bixby Creek Bridge Express Mail Stamps Stuart Katz

Custom Sku: SK-10024

$550.00

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1934 Color Shift ERROR Zip Block of 4 - 18¢ Frederic Remington - Stuart Katz

$70.50

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2201b, Black Color Omitted Booklet of 2 ERROR Panes CV $100 - Stuart Katz

Custom Sku: SK-12696

$19.99

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1879a, 18¢ Flowers Misperforated ERROR Plate # Block of 16 Stamps - Stuart Katz

$371.30

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2566b, Mint NH 29¢ Comedians Color Omitted Booklet Pane ERROR -- Stuart Katz

$305.50

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2121b, Mint NH 22¢ Sea Shells Color Omitted Booklet Pane ERROR -- Stuart Katz

$305.50

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1477, Large Misperforation Shift ERROR Plate Block of Four Mint NH - Stuart Katz

$70.50

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1690, 13¢ Bicentennial Dark Blue Color Shift ERROR PL# Block of 20 Stuart Katz

$235.00

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1804, Large Misperforation ERROR PB of 12 Stamps Black Heritage - Stuart Katz

$141.00

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496, Mint VF NH 5¢ Coil Line Pair Cat $65.00 - Stuart Katz

$25.00

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1767a, Misperforation Shift ERROR Plate Block of 16 Stamps 15¢ Trees Stuart Katz

$376.00

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1845, Misperforated ERROR 2¢ Plate Block of 12 Stamps - Stuart Katz

$42.30

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J63 Mint VF-XF NH 3¢ Plate Block of Six Stamps Cat $275.00 - Stuart Katz

$225.00

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2104, Misperforation Shift ERROR PB of 20 - 20¢ Family Unity - Stuart Katz

$329.00

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2015, RARE Reverse Printing Under Gum Plate Block of Four Stamps - Stuart Katz

$164.50

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2527a, Outstanding Foldover ERROR 29¢ Rose Booklet Pane - Stuart Katz

$282.00

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2979a, 32¢ Carousel Horses Misperforation ERROR Plate Block - Stuart Katz

$141.00

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1699, Amazing Paperfold ERROR Plate Block of 12 Stamps 13¢ Maass - Stuart Katz

$141.00

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2066, Misperforated ERROR Alaska Plate Block PL# Captured on Stamp - Stuart Katz

$141.00

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1752a, Huge Misperforated ERROR Block of 4 With PL# 13¢ Stamps MNH - Stuart Katz

$79.90

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1477, Large Misperforation Shift ERROR Block of Four Mint NH - Stuart Katz

$56.40

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2247a, Silver Color Omitted ERROR 22¢ Pan Am Games Mint NH - Stuart Katz

$465.30

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2443b, Blue Omitted Booklet Pane ERROR in Booklet Cover - Stuart Katz

$705.00

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1934, Imperforate Top Margin Plate Block of Four Remington Stamps - Stuart Katz

$84.60

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1705, Two Different Large Color Shift ERRORS Mint NH - Stuart Katz

$47.00

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1938a, Misperforated ERROR York Town Plate Block of Four Stamps - Stuart Katz

$79.90

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