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    

Ckstamps: Us Old Stamps Scott #2 10c Imperf. Washington 1847 Used 2014 Cv $1000Us 10c Imperf 1847 Sc 2 Used Cat Value $1000Us Stamp:#2115f 22c Flag Over Capitol Imperf Major Error Pl #3 Cv $1,000 RareHawaii 1853 Imperfs 5c Blue Unused/mm 2 Stamps Faults G2232U.s. #459 Choice Mint Vf/xf Nh - 1914 2c Carmine, Imperf Coil ($275)3535 Porky Pig *imperf Die Cut* 34c Mint Superb-nh SheetDr Jim Stamps Old Us Revenue Scott R36b 10c Inland Exch Part Imperf Pair $15 CvUs Stamp:#2550a "cole Porter" Imperf Horizontal Strip Of 3 Mnh Major Error+cert.Us, 1850s 1c Imperf Franklin, #9, Used Strip Of (3), Note DamageUs 1935 Mnh Issued No Gum 10c National Park Imperf Plate Block Sc# 765U.s. #756-65 Set Of Corner Margin Blocks - 1935 Imperf Parks ($62+)Dr Jim Stamps Old Us Revenue Scott R16b 3c Foreign Exchange Part Imperf $950 CvDr Jim Stamps Old Us Revenue Scott R18b 3c Proprietary Part Imperf $1000 Cv NrU.s. #1804 Var Mint Nh - 1980 Banneker, Imperf Pair1989 Us-russia Joint Upc Space Issue, Us #c126, Russia #5837, Imperf S/sDr Jim Stamps Old Us Revenue Scott R1b 1c Express Part Imperf $55 Cv No ReserveDr Jim Stamps Old Us Revenue Scott R37b 10c Power Of Atty Part Imperf $30 Cv NrDr Jim Stamps Old Us Revenue Scott R6b 2c Bank Check Part Imperf $60 Cv NrDr Jim Stamps Old Us Revenue Scott R19b 3c Telegraph Part Imperf $30 Cv NrU.s. #368 Choice Mint Superb Nh - 1909 2c Lincoln Imperf U.s. #347 Choice Mint Vf Nh - 5c Blue, Imperf ($60)Noblespirit No Reserve My/1065 Unlisted Imperf Between #68 Potential Error Dr Jim Stamps Old Us Revenue Scott R42b 20c Inland Exch Part Imperf Pair $60 CvU.s. #343-47 Scarce Used Pairs - 1c - 5c Imperfs, Dlw ($245)Dr Jim Stamps Old Us Revenue Scott R67a $1 Entry Of Goods Imperf Pair $150 Cv NrDr Jim Stamps Old Us Revenue Scott R27b 5c Inland Exchange Part Imperf NrDr Jim Stamps Old Us Revenue Scott R42b 20c Inland Exch Part Imperf $22.50 Cv NrDr Jim Stamps Old Us Revenue Scott R24b 5c Certificate Part Imperf $15 Cv NrUs Stamp:#368 2c Carmine Lincoln Imperf. 1909 Mnh/og Stamp PairUs Stamps Scott# 343 Schermack Type Iii Imperf 1c Green MnhDr Jim Stamps Old Us Revenue Scott R27b 5c Inland Exch Part Imperf Pair $42 CvScott #532 Washington Type Iv Imperf Offset Mint Block Nh Scott Cv $280 (lot 5)Dr Jim Stamps Old Us Revenue Scott R15b 2c Internal Rev Part Imperf No ReserveCkstamps: Us Stamp Collection Scott#525 Mint Nh Og Imperf BetweenUs Stamp:#373 2c Carmine Imperf 1909 Hudson-ful​ton Mh/og StampU.s. #371 Choice Used Pair - 1909 2c Seward Imperf3205 Sylvester & Tweety - Mnh Pane Of 10 Imperf Single, VfUs Scott 11 320th Upu Congress Futuristic & Traditional Mail Delivery Lot Perf/imperf UsedDr Jim Stamps Old Us Revenue Scott R40b 15c Inland Exchange Part Imperf $14 CvDr Jim Stamps Old Us Revenue Scott R46b 25c Insurance Part Imperf $19 Cv NrDr Jim Stamps Old Us Revenue Scott R9b 2c Express Part Imperf $35 Cv No ReserveDr Jim Stamps Old Us Revenue Scott R52b 30c Inland Exch Part Imperf $90 Cv NrDr Jim Stamps Old Us Revenue Scott R25b 5c Express Part Imperf No ReserveDr Jim Stamps Old Us Revenue Scott R36b 10c Inland Exchange Part Imperf NrDr Jim Stamps Old Us Revenue Scott R48b 25c Power Of Atty Part Imperf $45 Cv NrNew York State Revenue Imperf Pair, St3a, 1905, UnpricedDr Jim Stamps Old Us Revenue Scott R75a $1 Power Of Atty Imperf Pair $250 Cv NrDr Jim Stamps Old Us Revenue Scott R78a $1.50 Inland Exch Imperf Pair $140 Cv NrDr Jim Stamps Old Us Revenue Scott R24b 5c Certificate Part Imperf Pair $150 CvDr Jim Stamps Old Us Revenue Scott R25b 5c Express Part Imperf Pair $100 Cv NrUs Stamp:#371 2c Carmine Alaska-yuk​on Imperf 1909 Mnh/og Stamp U.s. #483-84 Choice Mint Nh - 3c Violet, Imperfs ($40)Dr Jim Stamps Old Us Revenue Scott R50a 25c Warehouse Recpt Imperf Pair $250 CvDr Jim Stamps Old Us Revenue Scott R40b 15c Inland Exch Part Imperf Pair $50 CvUs Stamp Scott #14 10c Imperf Used Hinged TornUs Stamp:#371 2c Carmine Alaska-yuk​on Imperf 1909 Mnh/og Stamp Line Pair1916-17 Us Imperf 2c Sc 482 Nh Cat $6Dr Jim Stamps Old Us Revenue Scott R5b 2c Bank Check Part Imperf No ReserveDr Jim Stamps Old Us Revenue Scott R53b 40c Inland Exchange Part Imperf Nr