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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Us 10c Imperf 1847 Sc 2 Used Cat Value $1000Us 1906-08 Regular, Imperf 5c Blue #315 Mint Nh Cat Val $1300Scott #21 Unused 1864 5c. Blue Numeral Imperf Cv $900.00Scott #6 Unused 1853 King Kamehameha Iii Imperf Cv $850.00Scott 17 Xf Used 12c Black Washington, 1851 Imperf, W/ Fancy Steamship Cancel1861 Usa #143l4 Wells Fargo $2 Pony Express Green Imperf Fn 2+ Margins Mh ThScott #9 Unused 1861 King Kamehameha Iii Imperf Cv $375.00Imperf 3c Wash # 11 On 1856 Insurance Policy Alexandria Va To Barhamsville VaScott #11 Used 1850's Washington Imperf W/ Wide Left Margin1861 Usa #143l5 Local Wells Fargo $4 Pony Express Black Imperf Vf 3+ Margins MhPhilippines #347 Mint Nh Block - 1931 Yellow Ornge Imperf ($44)1875 Scott Usa Lo3 Carriers' 1c Franklin Blue On Rose Xf Imperf Lc1875 Scott Usa Lo5 Carriers' 1c Eagle Blue Fn-vf Mng ImperfUs 1875 Imperf 5c Red-brown #3 No Gum Cat Val $850U.s. #373 Mint Vf Plate Block - 1909 2c Hudson-fulton Imperf ($240)Noblespirit No Reserve (mbo) Usa 1980 Veterans No. 1825 Imperf Pair X5 $1,875 CvU.s. #17 Used Beauty - 12c Black, Imperf ($250)Us 1847 Imperf 10c Black #2 Mint H Cat Val $35000Scott #11 Xf Used 1850's Washington Imperf 368, 371,373, Linc/ Ala/yuk / Hud/fulton Imperf Pairs Vf/xf Ogh Cv $120.00Us Stamp:#r78a $1.50 Blue Inland Exchange 1862-71 Revenue Stamp Imperf PairImperf 3c Wash # 11 Position 89l3 On Cover West Point Ny To Norfolk CtUs ~ Efo 2000 #3052 33c Coral Pink Rose Imperf Error - MnhUs ~ Efo #2280c 25c Flag Over Yosemite Coil Miscut Imperf Pair - MnhU.s.a. # 314 Imperf. Franklin Mint Og Vlh (2 Scans)Buffalo Stamps, Scott #484 Imperf Plate # Block Of 4, Mint Nh/og & Xf, Cv = $120Scott #11 Xf Used 1850's Washington Imperf Deep Reddish Brown ShadeChina Stamp: 1896-97 Nanking Local Post Stamp 1c Dull Vermilion Ln16 Imperf Noblespirit No Reserve {4148/77} Us No.343-346,408-409 Imperf Pairs Mnh =$151.70U.s. #577 Mint Rtc Plate Blocks - 1922 2c Washington, Imperf ($145)U.s. #531 Mint Vf Nh Plate Block - 1c Green, Imperf Offset ($190)Us 1851-57 Imperf 12c Black #17 Mint H Cat Val $62503535 Porky Pig *imperf Die Cut* 34c Mint Superb-nh SheetScott #11 Vf Used 1850's Washington Imperf Us Scott 346 4c Brown, 1908-09 Imperf, Mint, Nh Og Xf1851 Scott Usa Lo2 Carriers' 1c Eagle Blue Fn Mh Og ImperfUs ~ #3054 32c Yellow Rose Miscut Imperf - MnhU.s. #1618b Mint Nh Line Pair - 1975 13c Liberty Bell, Imperf ($67)Us Revenue 2 Cent Bank Check Imperf Used With Railroad CancelUnusual Franking Imperf Lincoln # 368 Block 5 Registered 1914 Philadelphia Pa1861 Scott #1 Csa Davis 5c Green Stone 2 Imperf Fn 2+ Margins Th Imperf UsedUs 1847 Imperf 5c Dark Brown #1a Mint Lh Cat Val $8750Buffalo Stamps, Scott #345 Washington Used Imperf Pair, Xf W/ Cool Cxl, Cv = $80 1¢ Wonders - Us #771 Vf Mint No Gum As Issued 16¢ Imperf #y37Us ~ Efo 10c People's Right To Petition For Redress Imperf Error PairUsa # Lot National Parks Unused Imperf. Cat 3392 Wile E. Coyote & Road Runner *imperf Die Cut* 33c Mint Superb-nh SheetScott #314, 320 Used 1906 Imperf Stamps Cv $39.00 1¢ Wonders - Us 3¢ Washington/franklin Vf Mint Imperf #a1023Comp Set National Parks Imperfs #756-765 Mint + ExtrasCalifornia - Nevada County - Nevada City - Nev-1220-4 - #14 Imperf 10ct To NyHawaii, #29 Imperf. Mlh Og Stamp, See Scans, Lot - 311935 Farley Selection-national Parks-imperf.-mintScott 482 M/nh/og 2c Carmine Washington Imperf, Plate Strip Of Three (3)U.s.a. # 346 Washington Imperf. 1908-09 Issue Mog Lh (2 Scans)U.s.a. Two Shades For Two Imperf. 3 Cents Washington Mog Vlh (2 Scans)U.s.a. Two Shades For Two Imperf. 2 Cents Washington Mog Nh & Lh (2 Scans)Error Stamp: Us Scott# 2609a, Imperf PairBuffalo Stamps: Scott #343-347 Washington/franklin Imperf-dlwm, Vf, Cv = $1203307 Duffy Duck *imperf Die Cut* 33c Mint Superb-nh Sheet