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”)

1847USA

1847USA

Bob Allen's beautiful and well organized catalog of US stamps from 1847 to 1970 is a fantastic resource for all US … [read review or visit site]

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    

1847 United States Imperf. 10c Scott 2. Used. Cat $1000Ckstamps : Us Stamps Scott#315 5c Blue Lincoln Imperf.cut From Pair Mint Cv$650Us Stamp:#15 10c Green Type Iii 1857-61 Imperf. Used Stamp1847 Us Imperf. 5c Sc 1 . Lightly Hinged. Cat $6750Us Stamp:#2 10c Black Washington Imperf 1847 Stamp Full Margins1851-57 United States Imperf. 12c Scott 17. Lightly Hinged. Cat $6250Ckstamps: Us Stamps Scott#1 5c Red Brown Imperf. Franklin 1847 Used 2014 Cv$4251847 United States Imperf. 5c Scott 1. Used. Cat $425U.s. #459 Choice Mint Vf Nh - 1914 2c Carmine, Imperf Coil ($275)Us Scott 459-1914 Imperf Coil- 2 Cent-m/nh/og-cat Val $675+60% NhCkstamps: Us Stamp Collection Error/efo Mint Nh Og "imperf"Philippines 347 Unused George Washington Imperf Plate Block 1-4g7 0121847 United States Imperf. 10c Scott 2. Used. Cat $1000Philippines 348 Unused Imperf Plate Block 1-4g7 011Ckstamps: Us Stamp Collection Error/efo Mint Nh Og "imperf Pair"Ckstamps: Us Stamp Collection Error/efo Mint Nh Og "imperf Pair" Dull GumUs Stamp:#10a 3c Washington Imperf 1851-57 Issue Used Stamp 69l5e $325United States Imperf 10c Scott 2 . Used. Sc $1000United States Imperf 5c Scott 1 . Used. Sc $425Philippines 344 Unused Imperf Block 1-4g7 010Ckstamps: Us Stamp Collection Error/efo Mint Nh Og "imperf Pair"Ckstamps: Us Stamp Collection Error/efo Mint Nh Og "imperf Pair"025).u.s. #'s 754-765 Imperfs. Mint, No Gum As Issued, Never Hinged. Complete NaUnited States-selection -first Issue-imperf-1847-faulty/fine-u/m-valuableCkstamps: Us Stamp Collection Error/efo Mint Nh Og "imperf Pair" Dull GumUs Stamp:#10a 3c Washington Imperf 1851-57 Issue Unused Stamp $1,250Ckstamps: Us Stamp Collection Error/efo Mint Nh Og "imperf Pair"Ckstamps: Us Stamp Collection Error/efo Mint Nh Og "imperf Pair"Ckstamps: Us Stamp Collection Error/efo Mint Nh Og "imperf Pair" Dull GumUs Sc 533 2c Carmine Mint Nh Og Imperf Washington F/vf Cat$400+Ckstamps: Us Stamp Collection Error/efo Mint Nh Og "imperf Between"Scott #1897a Mint Nh Imperf Error Pair Cv $45.00Mr Fancy Cancel 1304cd 5c Washington Imperf Pair Aps Cert Cv$375 ItalicsCkstamps: Us Stamp Collection Error/efo Mint Nh Og "imperf Between"Usa Stamp #12 5c Red Brown 1851-57 Imperf Issue Used Ckstamps: Us Stamp Collection Error/efo Mint Nh Og "imperf Pair"Ckstamps: Us Stamp Collection Error/efo Mint Nh Og "imperf Pair"Ckstamps: Us Stamp Collection Error/efo Mint Nh Og "imperf Pair" Dull GumUs 1935 Mnh Issued No Gum 7c National Park Imperf Plate Block Sc# 761Ckstamps: Us Stamp Collection Error/efo Mint Nh Og "imperf Pair"Us Stamps #4898-4905 Vintage Circus Posters Imperf Sheet Of 16 Mnh RareCkstamps: Us Stamp Collection Error/efo Mint Nh Og ImperfCkstamps: Us Stamp Collection Error/efo Mint Nh Og ImperfUnited States 1851 George Washington 10c Green Imperf Type Ii Scott No. 14, MhCkstamps: Us Stamp Collection Error/efo Mint Nh Og "imperf Pair"(13) Used Early 1900's Imperf Usa StampsCkstamps: Us Stamp Collection Error/efo Scott#1622 Mint Nh Og "imperf Between"Ckstamps: Us Stamp Collection Error/efo Mint Nh Og "imperf Pair" Dull GumCkstamps: Us Stamp Collection Error/efo Mint Nh Og "imperf Pair"Usa 1850's Washington Imperf Stamps Lot Used Ckstamps: Us Stamp Collection Error/efo Mint Nh Og "imperf Pair"Us 1934-5 Mnh 3c Wisconsin Perf And Imperf Plate Blocks Sc# 739 And 755Canal Zone 1909 Sg36 Variety Imperf Printers Proof Recess Print On Thick PaperScott#1597e, 15c Americana Flag, Vert Imperf Pair. Nh.Scott#2115f, 22c Flag, Imperf & Mis-cut Coil Pair, Nh.# 320 Imperf Strip W/schermack Type Iii Perfs Mog Lot3454# 409 Imperf Pair W/brinkerhoff Iib Perfs Mog Lot3460Us Mint Sheet Scott # 4814, "global Forever', Imperf/no Die Cuts, MnhCkstamps: Us Stamp Collection Error/efo Mint Nh Og "imperf Pair" Dull GumCkstamps: Us Stamp Collection Error/efo Mint Nh Og "imperf Pair" Dull Gum