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.


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1847 Us Imperf 5c Sc 1 Used Cat $425U.s. #315 Mint Superb App - 5c Lincoln, Imperf ($325)Ckstamps : Us Old Stamps Scott #1 5c Franklin 1847 Imperf. Used 2014 Cv$425Us Scott 17 12c Washington Imperf Of 1851 Used G0150 Washington Franklin Stamps (1908-1920 Issues) Including Imperfs And CoilsClassic Used U.s. Stamp Sc# 11 Imperf. 1851 W/ Fancy Cancel Item # C260U.s. #756-65, 771 Set Of Centerline Blocks - 1935 Imperf Parks ($205)U.s. #611 Superb Nh Block - 2c Harding, ImperfUsa 1862/71 1st Revenues Imperf & Perf $2 Conveyance Probate Martgage (8) C5259Usa 1851-57 Franklin Washington 1c + 3c Imperf 2 Used StampsUsa 1862/71 1st Revenues $2.5&$3 Exchange Charter Imperf & Perf (8 Items) C5258Imperf Pair - #1520b 10c Memorial....xf Og Nh -start@99cU.s. #575-77 Mint Blocks - 1c - 2c Imperfs ($48)U.s. #575 Mint Nh Blocks - 1c Green, Imperf ($200)Imperf Pair - #2136b 25c Bread Wagon....xf Og Nh -start@99cU.s.a. # 750 & 751 Imperf. S Sheets Both Mint Og Nh (2 Scans)Us Fdc First Day Covers # 751 Yosemite National Park Imperf 1934 Dc U.s. #1804 Var Mint Nh - 1980 Banneker, Imperf Pair1968 "flag Over White House" Imperf Mail Early Efo Mnh Sc #1338Imperf Pair - #1597e 15c Flag....xf Og Nh -start@99cUs 1935 Mnh Issued No Gum 8c National Park Imperf Plate Block Sc# 763Imperf Pair - 1058a 4c Lincoln....f+ Og Nh -start@99cU.s. #346-47 Mint - 4c - 5c Imperfs, Dlw ($41)Imperf Pair - #1891a 18c Lighthouse....xf Og Nh -start@99cImperf Pair - #1519a 10c Flags....xf Og Nh -start@99c1912 Us Imperf 2c Sc 409 Nh Cat $9.5No Die Cut Imperf Gutter 2014 Circus $2 S/sh From Press Sh. Please See ShippingImperf Pair - #2609a 29c White House....xf Og Nh -start@99cWashington Franklin Precancel: Weehawken (nj) Type 463 In Imperf PairUsa Stamp #11 3c Washington Imperf . 1851-57 Used Us Stamp:#900a 2c Rose Carmine 1940 Mnh/og Stamp Pair ImperfUs Stamp Sc 459 2c Carmine Mint Nh Og F/vf Washington Imperf Coil Cat$600Washington Franklin Imperf Vending Group Schermack, MailometerWashington Franklin Imperf Vending Group Schermack, MailometerError - #2609b 29c White House....imperf Between Pair, Nh -start@99cImperf Pair - #1618b 13c Liberty Bell....vf Og Nh -start@99cU.s. # 631 1-1/2~~ Sc 1895d 20Usa Mint Stamps Imperf Farley National Parks Issues 1114 355Nice Us 348 Mnh ImperfNice Us 346 Mh ImperfImperf Pair - #1596a 13c Flags....xf Og Nh -start@99cUs Stamp:#rja105a 1c Violet Imperf Narcotic Stamps On Medicine Box MeperganNoblespirit No Reserve 12/14/h/19 Excellent Us 631 Fdc Vf Imperf Pair Dc Cancel!Noblespirit No Reserve 12/14/m/9 Excellent Us 371 Mlh Imperf Pair =$37 CvUs Stamp:# 1c Violet Imperf Narcotic Stamps On Medicine Box NumorphanU.s. # 4822 & 4823 Medal Of Honor Used F Ng Pair 2013 W/o Diecuts ImperfLa99617 Usa Imperf Abraham Lincoln Memorial Good Sheet MnhUs 1935 Mnh Issued No Gum 7c National Park Imperf Plate Block Sc# 762#14 Us 10 Cent Green Washington-used-n/g-fine-vf-imperfU.s. # 611 2Us Sc# 2280c Yosemite 25c Strip Of 4 Imperf Between - Mint Nh OgImperf Pair - #2130b 10.1c Oil Wagon....xf Og Nh -start@99cUs 731 Mnh 1933 Aps 3U.s. # 4822 & 4823 Medal Of Honor Used F Ng P# Block 2013 W/o Diecuts ImperfImperf Pair - #1894a 20c Flag....xf Og Nh -start@99cNice Us 347 Mh ImperfUs Stamps Sc# 610, 611 & 612 2c Harding Perf & Imperf Mint Og Nh-lh A-28U.s. # 4822 & 4823 Medal Of Honor Used F Ng Pair 2013 W/o Diecuts ImperfOld Used U.s. Confederate States Stamp Sc#11 Imperf. Item # C276