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    

Ckstamps : Us Stamps Scott #2 10c Imperf. 1847 Washington Used L. Cancel Cv$1000Hawaii Imperfs Fillers Forgeries (8 Stamps)g5534U.s. #368 Choice Mint Vf Plate Block - 1909 2c Lincoln, Imperf ($200)Hawaii Imperfs M&u Fillers Forgeries Specimen(s237)Scott #14 Used 1855 Type Ii Green Imperf Washington Cv $180.00Hawaii Imperfs Fillers Forgeries (10 Stamps)g5535Ckstamps Ny Ebay : Us Old Stamps Scott #1 5c Imperf. Franklin 1847 Used Cv$450U.s. #371 Mint Vf Plate Block - 1909 2c Seward Imperf ($225)Hawaii Imperfs Specimen Cancelled Fillers Forgeries (6 Items)g5533Washington-franklin Mint Coil & Imperf. PairsScott #9 Used 1852 Blue Franklin Imperf Cv $120.00Hawaii Imperfs Fillers Forgeries M&u(16 Items) G5532Us Stamps Revenue 1st Issue Imperf And Part Perf Ao Album Pages Scott #9 Unused 1852 Blue Franklin Imperf Cv $275.00Hawaii Imperfs Mm Fillers & Forgeries(2 Blocks ) (s234)U.s.stamp:scott#11a, 3c, Red, Type Ll, The Regular Imperf. Series Of 1851-57U.s. #371 & #373 Mint Hinged O.g. Imperf Pairs $77.50 Scv Nice!!Usa Used 1860's Grilled Imperf ? -- Possibly TrimmedWashington-franklin (18) Mint Coil & Imperf. SinglesLoony Tunes~imperfs~3205,3307,3392,3535~cat $185~sylvester~daffy~porky~more! #320-577 Imperf Group Unused Lot3917Scott #373 Vf Mint Nh 1909 Expo Imperf Pair Cv $90.00Us Scott #540a 2c Washington Type Lll Mh,og Imperf. Pair StampScott #371 Vf Mint Nh 1909 Seward Imperf Pair Cv $77.50Scott #314 Xf Mint 1906 Franklin Imperf Pair Hawaii Imperfs M&u Fillers Forgeries(s236)V-stamps, Us Revenue, R13a, Proprietary, Blue, 2 Cents, Imperf., Scv: $1200Us Scott #14 10¢ Imperf Used Faulty Cv 160.00Scott #343-346 Mint 1908-1909 Imperf Stamps U.s. #17 Used Beauty - 12c Black, Imperf ($250)Us Scott #534 1918-20 2c Washington Offset Imperf. Type Va Mh,og StampPhilippines 1932 Flight Cover Imperf Portraits Aamc 71 Baguio Manila 4g86Philippines Cover Imperf Portraits 1932 Jan 14 Manila California 4g82Philippines 1932 Flight Cover Imperf Portraits Lof Aamc 71 Baguio Canada 4g851850's 11 3ct Washington Imperf Sheet Margin & Line At Left 4 Margins UsedU.s. #371 Choice Mint Vf Pair - 1909 2c Seward ImperfU.s. #631 Mint Nh Plate Block - 1 1/2c Harding, Imperf ($85)Scott #368 Pair, 371, 373 Used 1909 Expo Imperfs Cv $101.50Us Scott #631 1926~31 1 1/2c Harding Imperf. Mh,og StampScott #11 Used 1850's Washington Imperf Red CancelScott #531 Used 1919 Washington Imperf Pair Cv $52.50Scott #538a Mint Imperf Between Block Cv $110.00Scott #17 Used 1851 Black Imperf Washington Cv $280.00Us Scott #535 1918-20 3c Washington Offset Imperf. Type Iv Mh,og StampUs Stamp Mnh 1909 Alaska-yukon-pacific Expo Issue Imperf #371Scott #11 Vf Used 1850's Washington Imperf Pen CancelPhilippines 345 Mint 12c Lincoln Imperf Never Hinged Cv $15.00 5c22 5373 Hudson-fulton 2c Carmine Steamships Imperf Mh Creasing $20 See Photos X-276Scott #11 Vf Used 1850's Washington Imperf Blue CancelScott #11 Used 1850's Washington Imperf Green Cancel Cv $190.00Scott #9 Used 1852 Blue Franklin Imperf Scott #482 & 483 Pairs - Uw Imperf - Very Nice (aew12)Scott #314 Vf Used 1906 Franklin Imperf Us Stamp:#10 3c Washington Imperf 1851-6 22kt Gold Replica Cover Fresh! 3535 Porky Pig *imperf Die Cut* 34c Mint Superb-nh SheetUsa 1920s Imperf Pair Eadmar Hotel Cover Mason City Iowa To Detroit MichiganUs Scott #531 1918-20 1c Washington Offset Imperf. Mh,og Stamp373 Hudson-fulton, 2Ȼ Carmine Imperf., Mh, Sound, Catalog $59Scott #11 Vf Used 1850's Washington ImperfUs Scott #756~#765 1935 Imperf.national Parks Mh,ng Set Of 10 Pair Stamps