While there are numerous types of perforated stamps, with anywhere from seven to 16 1/2 perforations in the space of two centimeters, there are really only three types of imperforate U.S. stamps. The first are those issued before 1857, when the first three-cent stamps bearing the profile of George Washington were printed by Toppan & Carpenter of Philadelphia and perforated using a rotary perforating machine manufactured by Bemrose & Co. of Derby, England. The second type of imperforates are errors, or stamps that were intended to be perforated but somehow managed to slip through the machinery unscathed.

A third class of imperforate stamps encompasses those issued between 1907 and 1927 on imperforate coils, which were designed for, and sold to, private vending companies such as Brinkerhoff, Farwell, Schermack (which became Mailometer), and U.S. Automatic Vending. The machines made by these companies perforated the stamps for customers as they were dispensed. In some cases, completely imperforate stamps can be found from these rolls, but many have circular or “hyphen-hole” perforations between each stamp, with no perforations on the outside edges. U.S. Automatic Vending was known for its notched stamps, in which the corners of stamps were cut off to make them easier to tear.


Best of the Web (“Hall of Fame”)

The Stamp Collecting Round-up

The Stamp Collecting Round-up

Don Schilling's long-running, in-depth blog on stamp collecting and postal operations. Schilling stays up on all th… [read review or visit site]

National Postal Museum

National Postal Museum

If you're into postal history or collectibles, check out the Smithsonian's National Postal Museum. This extensive s… [read review or visit site]

R. A. Siegel Auction Galleries

R. A. Siegel Auction Galleries

This auction house site offers an extensive online database of US stamp information. Includes PDF catalogs of past … [read review or visit site]

Post Office in Paradise

Post Office in Paradise

Post Office in Paradise showcases Hawaiian postal history from the years before Hawaii became a part of the United … [read review or visit site]

Private Die Proprietary Stamps

Private Die Proprietary Stamps

Bob Hohertz's impressive database of U.S. Private Die Proprietary stamps from the Civil War and Spanish American Wa… [read review or visit site]

Alphabetilately

Alphabetilately

First shown in 2008 to celebrate the Smithsonian National Postal Museum's 15th anniversary, Alphabetilately is esse… [read review or visit site]



Clubs & Associations

Most watched eBay auctions    

Us Stamp:#459 2c Carmine 1914 Coil Imperf Mnh/og Single Stamp + Certificate1851-57 Us Imperf 12c Sc 17 Vlh Cat $6250Ckstamps : Us Stamps Scott #1 5c Imperf. 1847 Franklin Used Cv$425 W/pfc Sound!Ckstamps : Us Old Stamps Scott #1 5c Franklin Imperf. 1847 Used 2014 Cv$425Us Stamp:#65c 3¢ Rose Imperf Error Unused Stamp Us 12c Imperf 1851-57 Sc 17 H Cat Value $6250Us 5c Imperf 1847 Sc 1c Cover Cat Value $10500Noblespirit No Reserve Nyc/1080 Remarkable Us National Parks Imperf. Set Us 5c Imperf 1847 Sc 1a Cover Cat Value $910Us 5c Imperf 1847 Sc 1 Cover Cat Value $925Us 5c Imperf 1847 Sc 1 Cover Cat Value $500Scott #346 Mint Imperf Pair #347 Mint Imperf Single Cv $56.50Ckstamps: Us Stamp Collection Scott#525 Mint Nh Og Imperf BetweenUs 5c Imperf 1847 Sc 1 Used Cat Value $425Scott #314 Xf Mint Nh 1906 Franklin Imperf Pair Cv $70.00Philippines Mint Yf1 Imperf Aguinaldo Registry Stamp Back Of The Book Mog 5b22 9100% Imperf Albino Completely Blank Strip Of 5 Tiny Hint Of Flag On Gum SideUs # 7 One Cent 1c Imperf Blue Franklin Used (cv $150) (me1512)U.s. #343-47 Vf Mint Set - 1c - 5c Imperfs, Dlw ($90)Buffalo Stamps: Scott #331-499 Washington/franklin Imperfs &, Singles, Huge Cv1c Imperf # 383 Centerline Block On 1928 Cam 8 Multi Leg Flight Aamc 8n4 WordenJay's Stamps 2000 Roadrunner & Wile E. Coyote Imperf Pane 10 - 33¢ Stamps 3392Usa : 1935 Kapner. Set Of #756-65 Imperf Blks Of 4 Cplt On 'non-delivered' Fdcs.3 Cent Washington 1851-1856 Imperf Stamps - Set Of Nine (9) (me1496)Ckstamps: Us Error/efo Stamp Collection Mint Nh Imperf Booklet Usa Stamp #320 2c Carmine Imperf. Series Of 1903 Pl # Unused Pair Us Stamp:#1804 20c "black Heritage" Imperf Mnh/og Error Stamp PairUs Scott 4801, Made In America, Imperf No Die Cut, Uncut Press SheetUs Stamp:#156 1c 1873 Continental Bank Note Imperf StampOx21a, 1919 P.o. Seal Imperf Pane Of 20 Nh0307- Us #577 1923-25 2c Washington Imperf. Mh Line Blk Of 4 StampsUs Stamp: U.s. Olympic Committee 1948 London Games 3 Mnh Stamps Imperf Us, Harry Potter, Imperf No Die Cut, Uncut Press Sheet Us Stamp:#1 5c Red Brown Franklin 1847 Imperf 22kt Gold Replica Cover Fresh!Us Stamp #409 2c "washington" Mlh Imperf Center Line Block #r32a Used Imperf Bill Of LadingCkstamps: Us Error/efo Stamp Collection Mint Nh Og Imperf Pre-cancel#r19a Used Imperf Telegraph - Part Of Second Stamp Showing On Left Side[38306] U.s.a 1934 Good Very Fine No Gum Imperf. SheetUs 5c Imperf 1847 Sc 1 Used Cat Value $460Us Scott #575~#577 1923-25 Imperf. Mnh(#576)/h,og Set Of 3 StampsR11a 2ct Playing Card Imperf Used#r90a Used Imperf#r51a Used Imperf Part Of Second Stamp Showing Left SideCkstamps: Us Error/efo Stamp Collection Mint Nh Og Right Margin Imperf Us R9a Used, 2-cent Imperf Express Revenue Stamp, Washington,1862 Ckstamps: Us Error/efo Stamp Collection Mint Nh Og Imperf2c Imperf # 611 Block On 1928 Combo Cachet Cam 27 Flight Bay City Mi Aamc 27e9 (15) Used Imperf And Schermack Usa Stamps Us Stamp:#17 12c Black Washington 1851-56 Imperf 22kt Gold Replica Cover Fresh! Us Stamp:#12 5c Red Brown 1851-56 Imperf 22kt Gold Replica Cover Fresh!Ds Us Stamp Washington Collection Scott #535 (x2) Offset Imperfs Type Iv Used Usa Stamp #11 3c Washington Imperf . 1851-57 Used Us Scott #631 1 1/2c Harding Imperf. Mnh,og StampScott 534a, 2c Washington,imperf,type Vi,offset Press, Used, Clean, ShermackScott#343-347, 1c-5c Set Of Imperf Singles. Vf/xf.1850's Cover - 3c Washington Imperf Stamp - Charleston Sc - Cameo On BackflapCkstamps: Us Error/efo Stamp Collection Mint Nh Og Imperf At Right MarginUs Scott 4806, Inverted Jenny, Imperf No Die Cut, Uncut Press SheetR.r. Taylor Black Heritage 2015 Ndc Imperf Pane Of 20 From Press Sheet