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    

U.s. #459 Choice Mint Vf Nh W/cert - 1914 2c Carmine, Imperf Coil ($275)Us #17 Used 12c Grey Black 1851 Imperf Sound Four Nice Margins Us Sc 459 2c Carmine Ty I Mint H Og Imperf Coil Washington Xf Cat$600+Us Stamp:#r98a $20 Conveyance, Imperf 1862-71 Revenue Large Margins Us Stamp:-philippines- #341 4c Imperf. 1925-31 Mnh/og Stamp Blk Of 4U.s. #371 Choice Mint Superb Nh Pair - 1909 2c Seward Imperf ($72)3535 Porky Pig *imperf Die Cut* 34c Mint Superb-nh SheetBuffalo Stamps, Scott #3307 Daffy Duck Imperf Sheet, Mnh/og & Xf, Cv = $14Us Stamp Cat #575 Og Nh Block Of 4, Imperf 1 Cent Franklin GreenU.s. #246 Var Used - 1c Ultra, Imperf (?)Scott 533 1920 2 Cent Washington Regular Issue Imperf Type V Mh Og F-vf Cat $55!Us Stamp #531 1919 1c Imperf Washington Mint $10Us 1935 Mnh 2c National Park With Original Gum Imperf Plate Block Sc# 757U.s. #250 Mint Xf Jumbo - 2c Carmine, Type I Imperf (?)U.s.a. # 10 Imperf. '' Washington '' On Cover Piece & Fine Used ! Buffalo Stamps, Scott #3392 Road Runner Imperf Sheet, Mnh/og & Xf, Cv = $40Us Stamp:#631 1.5c 1926-28 Imperf. Rotary Ink Error Stamp0828- Us #499b 2c Imperf. Between Mh Pair StampsUs Stamp:#409 2c Carmine 1912 Imperf Mnh/og Stamp Imprnit ACkstamps: Us Stamp Collection Error/efo Mint Nh Og ImperfUs 1935 National Parks Imperf Blocks, Centre Line, Mnh No GumU.s. #343-47 Vf Mint Set - 1c - 5c Imperfs, Dlw ($58)Ckstamps: Us Stamp Collection Error/efo Mint Nh Og ImperfUs 1935 Mnh Issued No Gum 10c National Park Imperf Plate Block Sc# 765Us Stamp:#640 8c 1926-31 Rotary Press Stamp Imperf. Ink Error Mnh/og Stamp Buffalo Stamps, Scott #3535 Porky Pig Imperf Sheet, Mnh/og & Xf, Cv = $60U.s. #314, 320a Mint Vf - 1c - 2c Imperfs ($77)U.s. #347 Mint Vf Block - 5c Blue, Imperf, Dlw ($125)Ckstamps: Us Stamp Collection Error/efo Mint Nh Og ImperfUs Sc 11 3c Dull Rose Mint Ng Vf+ Imperf Washington Cat$125+Us 1923 Mnh 2c Washington Imperf Plate Block Sc# 577Confederate States - Mint Study Of 10c Jefferson Davis Imperf - Various Shades0828- Us #498c 1917-19 1c Perf.11 Mnh Imperf.between Pair StampsUsa Stamp #408 1c Washington Imperf 1912 Mnh/og PairScott#760, 5c Natl Parks Imperf Plate Block Of 6. Xf/superb & Nh.Us Stamp:#408​ 1c Green 1912 Imperf Mnh/og Stamp Plate #U.s. #368 Choice Mint Vf Nh Pair - 1909 2c Lincoln, ImperfLot Of 2 Imperf Pairs, Scn 754 & 755 Pairs, No Gum As Issued Sc# 532 Imperf -block Of 4 - H.m.c. In Margin -mint - Nh611 Mnh Imperf. Plate Block Of 6Us $6.60 Face M/nh Daffy Duck Perf #3306 & Imperf #3307 + Used Imperf PanesUs Stamp (l112) Scott# 770, Mint Nh, Imperf Horizontal Gutter PairUs Stamp (l133) Scott# 768, Mint Lh, Imperf Vertical Gutter PairUs Stamp (l109) Scott# 769, Mint Hr, Imperf Horizontal Gutter PairUs Stamp (l133) Scott# 768, Mint Nh, Imperf Horizontal Gutter PairUs Stamp (l115) Scott# 769, Mint Nh, Imperf Vertical Gutter PairCkstamps: Us Stamp Collection Error/efo Mint Nh Og ImperfThree Nice 1933 First Day Covers - One ImperfUsa Stamp #408 1c Washington Imperf 1912 Used Machine PerfUs Stamp:# Blue U.s. Olympic Committee 1948 London Games Mnh/og Stamp ImperfUsa Stamp #383 1c Green Imperf. Franklin 1910 UsedMr Fancy Cancel Scott 901a Mnh 3c Imperf Between Pair Efo #4140828- Us #1402a 8c Imperf. Pair Mnh Stamps0828- Us #1618b 13c Imperf. Pair Mnh Stamps0828- Us #1520b 10c Imperf.strip Of 3 Mnh Stamps0828- Us #1625a 13c Imperf. Pair Mnh StampsUs 1934 Mnh 3c Mothers Of America Perf And Imperf Plate Blocks Sc# 737 And 7541908 Us #343 - 1c Imperf Wmk 191 Right Inscriptional Pair Mint Nh, Scv $20.00 +New (10) Pieces Of 2014 Imperf $1.15 Sea Surface Temp Global Forever Stamp2 Panes Of 6 Ea. Us #735 Byrd Antarctic 3 Cent Imperf Stamps, Nat. Stamp Expo.