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    

Us #315 Imperf 5c -- Nh Pair With Pf CertUs #315 Imperf 5c -- Hinged Block Of 41847 Us Imperf 5c Sc 1 Used Cat $440Scott #17 Used 1851 Black Washington Imperf Red Cancel Cv $280.00Us Stamp:#533 2c (v) 1918-20 Imperf Offset Mh/og StampNdc Imperf 2016 Richard Allen Of 20 From Press Sheet- Please Read ShipingUs Stamp:#532 2c (iv) 1918-20 Imperf. Mnh/og StampNdc Imperf 2016 Botanical Art Bookletf 20 From Press Sheet- Please See Shipping1847 Us Imperf 5c Sc 1 Used Cat $4602016 Us Scott# 5040-49c Botanical Art - Plate Block Of 8+2 W/selvage - ImperfScott #315 Used 1908 Lincoln Imperf Four Margins Cv $1,250.004710p 2012 Earthscapes No Die Cut Imperf Sheet 15 Forever Stamps Free Us ShipUs Stamp:#11a 3c Washington Imperf 1851-57 Issue Stamp Stripe Of 3Scott #533 Xf Used 1920 Type V Washington Imperf Cv $125.00Mr Fancy Cancel 314 Pair 1c Imperf Very Fine++ Mint Never Hinged Cv$65++ No ReseUs Scott #1729a Valley Forge Xmas: Imperf Pair Error Stamps. Mnh ($65.00)Us Stamp:#11a 3c Washington Imperf 1851-57 Issue Stamp Used Mr Fancy Cancel 87l25 Hussey's Local Imperf Block Of 4 Listed Scott But UnpricedScott #3981a Liberty: Imperf - Die Cut Omitted Error Stamp Coil Pair. Mnh.Us Scott #2915ah Flag Porch: Imperf & Miscut Coil Pair Error Stamps.mnh ($32.50)Us Stamp:#2166a 22¢ "season's Greetings" Imperf. Pair Error Mnh StampScott #7 Used 1851 Type Ii Blue Imperf Franklin Cv $145.00U.s. #314 Used Block - 1902 1c Green, Imperf ($97)Usa Used Stamps Scott 484 Imperf Block Of 4 113 20151927 2c Imperf Harding Ponce Porto Rico Pr To California Puerto Cover LetterUs Stamp:#1 5c Red Brown Franklin 1847 Imperf Issue Used StampU.s. #756-65 Plate Block Set - 1935 Imperf Parks ($285)Scott #10 Used 1851 Orange Brown Washington Imperf Top Sheet MarginUs Stamps # 1804a Imp Error Pr Fine Og Nh Imperf Pair Scott Value $300.00Us Scott #2133b Pushcart: Imperf Coil Pair Error Stamps. Mnh ($40.00)Scott #531-532 Used 1919-1920 Washington Imperf Stamps Cv $49.50Us Scott #2518a Flower: Imperf Coil Pair Error Stamps. Mnh ($25.00)18 Three Cent Perf/imperf Washington Stamps Used With Fancy CancelsUs Stamp:#534a 2c (vi) 1918-20 Imperf Offset Mh/og StampUsa Used 1850's Washington Imperf Stamps LotScott #9 Used 1852 Type Iv Blue Imperf Franklin Ndc Imperf 2016 Lunar New Year Pane Of 12 From Press Sheet- Please Read ShipingScott #347 Used 1909 Blue Washington Imperf Cv $37.50Scott 730 Us 1c Ft Dearborn Imperf Sheet Of 25 Used (t3)Us Stamp:#384v 2c Carmine 1910 Imperf Mnh/og Stamp Coil Stamp Pair U.s. #611 Mint H/nh Block Of 24 - 2c Harding, Imperf ($185)Us Stamp:#347v 5c Blue 1908-09 Imperf. Mnh/og Coil Stamp Pair PasetupU.s. #368,371,373,611,314 Pair Mint Hinged O.g. Imperfs $87.25 Scv Nice!!Scott #314-1c Franklin-imperf.block Of 4 - Unused - Og - NhError - Imperf Pair - #1891a 18c Lighthouse....xf Og Nh -start@99cUs Scott #1897ac Locomotive, Train: Imperf Coil Pair Error Stamps. Mnh ($45.00)577 Washington Lh Imperf Block Of 4 W/ Sideographer Cv $5.20Farley# 771 16cent Imperf Air Mail Special Delivery Six Stamp Plate BlockEarly Us Revenue Stamp~r5~2c Bank Check Imperf~issue Of 1862-1871Scott 733 Us 3c Chicago Imperf Sheet Of 25 Used (t4)Us Stamp:#344v 2c Carmine 1908-09 Imperf. Mnh/og Coil Stamp PairCalifornia: #15 10c Imperf Yankee Jims, Ca Dpo To Illinois3535 Porky Pig Mnh Imperf Sheet Cv $95Us Scott #17 Vf Imperf Stamp With Red Cancel. Rare Cat.val 345.00 Us Scott #14 Used 1855 Type Ii Washington Imperf Cv $160.004703a 2012 War Of 1812 No Die Cut Imperf Sheet 20 Forever Stamps Free Us ShipUs Stamp:#535 3c Violet 1918-20 Offset Imperf Mnh/og Stamp LpScott #314 Mint Nh 1906 Imperf Franklin Cv $32.50Michigan. Detroit 1921 Machine Cancel Ties 1c Imperf Pair On Env With Label#343 Franklin 1c Imperf Left Pb/6, Imprint Type V, Engraver's Initials