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 Old Stamps Scott #2 10c Black Imperf Washington 1847 Used Cv$1050Us Stamp:#534a 2c (vi) 1918-20 Imperf Offset Mnh/og StampUs 5c Imperf 1847 Sc 1c Cover Cat Value $10500Us Stamp:#1 5c Red Brown Franklin 1847 Imperf Issue Large Margin+certificateU.s. #344 Mint Superb Plate Block - 2c Carmine, Imperf ($77)U.s. #17 Choice Used Vf - 12c Black, Imperf ($250)Us Stamp:#532 2c (iv) 1918-20 Offset Imperf Mnh/og Stamp $70Beautiful Complete Mint Set Of 1909 Stamps. #367-#373. 3 Pairs Of Imperf. MoghUs Imperf Sc # 17 1851-57 12c Mint H Cat $6250Us #r59a. 1862-71- 50 Cent Blue Mortgage- Block/3- Imperf.- Hand Cancel- Fine!U.s. #17 Used - 12c Black, Imperf ($250)Us Stamp:#2 10c Black Washington Imperf 1847 Used + Certificate, Large MarginMr Fancy Cancel Scott 720 Mh Horizonatal Imperf Between Ex Chervenyak Cvr #359Ckstamps: Us Stamp Collection Scott#3138 Error Bug Bunny Mint Nh Imperf 10thScott # 2 Us 1847 Imperf 10c Used Cat $1000Mr Fancy Cancel Scott 2104 Mnh Imperf Between Pair Ex Chervenyak Cvr #358Mr Fancy Cancel Scott 734 Mnh 13c Imperf Between Pair Ex Chervenyak Cvr #364Ckstamps: Us Error/efo Freaky Stamp Collection Mint Lh Og ImperfCkstamps: Us Error/efo Freaky Stamp Collection Mint Nh Og ImperfUs Stamp:#535 3c Violet 1918-20 Offset Imperf Mnh/og StampCkstamps : Us Old Stamps Scott #1 5c Imperf. Franklin 1847 Used Cv$450U.s. #538a, 540a Mint - 1c -2c Rotary, Imperf Between ($140)Ckstamps: Us Error/efo Freaky Stamp Collection Scott#c83a Mint Nh Og ImperfUsa...scott # 17 (12ct Washington Imperf)...fvf UsedU.s. #756-65 Choice Plate Block Set - 1935 Imperf Parks ($274)Us#66a.-1862 $1.00 Red Conveyance Rev.pair-1st Issue- Imperf.-hand Cancel-nice! Scott # 1 Us Imperf 5c H Cat $6750No Die Cut Imperf Us/japan Friendship Pane Of 12 From Press Sh. See ShippingMr Fancy Cancel Scott 1833 Mnh 15c Imperf Between Pair Ex Chervenyak Cvr #360Mr Fancy Cancel Scott 2529 Mnh 19c Imperf Between Pair Ex Chervenyak Cvr #361Franklin (imperf) 1851-57 Vf Used Cv $130Ckstamps: Us Error/efo Freaky Stamp Collection Mint H Og ImperfUs #3138 32¢ Bugs Bunny Imperf. Pane Of 10. 1 Imperf. Mognh Cv=$350. Rjm1a - Rjm3a, Imperf Sets 1937 1st Marijuana Stamps & Rjm5 - 8 With AttachedMr Fancy Cancel Scott 1934 Mnh 18c Imperf Between Pair Ex Chervenyak Cvr #362Ckstamps: Us Stamp Collection Scott#3535 Error Mint Nh Imperf Stamp On 10thU.s. #383-84, 481-484 Mint Nh - 1c - 3c Imperfs ($55)Usa Mint Rg Scott #9 1 Cent Franklin Blue Imperf Cv $490Ckstamps: Us Error/efo Freaky Stamp Collection Mint Lh Og ImperfUs Scott 10-1851-1857 3 Cent Washington On Cover-imperf- Brown-usedCkstamps: Us Error/efo Freaky Stamp Collection Scott#805 Mint Nh Og Top ImperfEarly Us Vending Machine Stamps + Precancels* Perfin* ImperfsUs Stamp:#534​ 2c (va) 1918-20 Offset Imperf Mnh/og Stamp Ckstamps: Us Error/efo Freaky Stamp Collection Mint Nh Og ImperfCkstamps: Us Error/efo Freaky Stamp Collection Scott#2609b Mint Nh Og ImperfCkstamps: Us Stamp Collection Scott#3307 Error Mint Nh Imperf Stamp On 10thUs Scott 11-1851-1857 Three Cent Washington-used-deep Claret-imperf-U.s. #343-47...mnh...vf...'imperf Set'...cat $140.00Ckstamps: Us Error/efo Freaky Stamp Collection Mint Nh Og ImperfCkstamps: Us Error/efo Freaky Stamp Collection Mint Nh Og ImperfUs Stamp (l1662) Scott# 755, Used Lh, Imperf Plate Block Of 6, Nice CenteringJuly Sale-lot 92-us Imperf Stamps #481, 482 & 484 MhUs Stamp:#10 3c Washington Imperf 1851-57 Issue Used Stamp Us Pre-cancel, Harding Imperf #576, With Schermack Vending PerfsTriggibby Us Stamps Sc# 754, 755, 767 & 771 Farley Imperf Blocks Mint Nh - 72Triggibby Us Stamps Sc# 768 3c Full Gutter Farley Imperf Blocks Mint Lh - 74U.s. Stamp #368 2c Lincoln Centenary Of Birth Imperf. (1909), Mnh Og, Slight Dg3535 Porky Pig *imperf Die Cut* 34c Mint Superb-nh SheetCkstamps: Us Error/efo Freaky Stamp Collection Mint Nh Og Imperf#373 Us 2 Cent Carmine-imperf-mint-n/h-fine Vf