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 5c Regular, Imperf 1906-08 Sc 315 Nh Cat Value $1300Us 1847 Imperf 5c Dark Brown #1a Mint H Cat Val $8750Us 1851-57 Imperf 12c Black #17 Mint H Cat Val $62501997 32 Cent Bugs Bunny Imperf Full Sheet Of 10, Scott #3138, Mint NhUs Stamp: #r168a 10c Brown 1898 Battleship Revenue Imperf Mh/og Stamp $40Us Stamp: #r163a 1c 1898 Documentary Revenue Stamp Imperf Pair Mh/og Stamp Us 12c Imperf 1851-57 Sc 17 H Cat Value $6250Us 5c Imperf 1847 Sc 1b Used Cat Value $750Us 1906-08 Regular, Imperf Nh 5c Sc 315 Cat $600Us Stamp: #rb28 2 1/2c Lake 1898 Proprietary Stamp Mh/og Stamp Imperf Pair $225Us 1847 Imperf 10c Black #2 Mint H Cat Val $35000Us Stamp: #r168a 10c Brown 1898 Battleship Revenue Imperf Stripe Of 4 ImprintU.s. #17 Used Beauty - 12c Black, Imperf ($265)Us 1847 Imperf Used 5c Sc 1 Cat $425Us 1847 Imperf 5c Dark Brown #1a On Cover Cat Val $950Us Stamp:#r82a $2 Mortgage Imperf 1862-71 Revenue Stamp On Deed Paper(23x17)Noblespirit No Reserve {3970} Usa Imperf Miss Perf Booklet Panes X11 1949aUs Stamp:#r84a $2.50 Inland Exchange 1862-71 Revenue Stamp ImperfU.s. #346 Mint Nh Pair - 4c Brown, Imperf ($62)Us Stamp:#611 2c Black 1923 Harding Imperf Precancel Marion Ohio Blk Of 8 ClScott#347, 5c Blue Imperf Pair. Wmk191. Vf/xf.U.s. #320 Mint Nh Pair - 2c Carmine, Imperf ($70)2c Imperf Paste Up Pair On 1923 Chandler Motor Cars Advertising Denver Colorado Us 5c Imperf 1875 Sc 3 Ngai Cat Value $850Us Stamp:#r78a $1.50 Blue Inland Exchange 1862-71 Revenue Stamp Imperf Pair $us Sc#534 M/nh/xf-superb, Imperf, Cv. $25# 484 Imperf Paste Up Strip/4 W/schermack Iii Perfs Mog Lot4840Le55832 Usa 1851 Imperf Eagle Pre-paid 1c Classic Stamp No Gum Cv 40€Scott#345, 3c Deep Violet Type I Imperf Pair. Vf/xf.Usa Imperf. Block (f366)Sc# 2096b - Smokey The Bear -vert. Strip Of 3 Imperf Between W/selvage Imperf**us, Sc# 1702a, Mnh, Vf, Imperf Pair, Cv $75.00Us Revenue Stamps #r69a Imperf On Warranty Deed 1863Le55978 Usa 1851 Imperf Benjamin Franklin 1c Classic Stamp Used Cv 110€Noblespirit No Reserve {4148/612} Us 1916-19 Imperf, Perf, Coil Mnh Group =$315Usa Imperf Block (f381)Scott#2523b, 29c Flag Coil Imperf Strip Of 4. Vf & Nh.Scott#343, 1c Green Franklin Imperf Pair. Vf.Us Stamp Scott 314 Block Of 4. Imperf.U.s. #576-77 Mint Nh Plate Blocks - 1 1/2c - 2c Imperfs ($90)Us Imperf 10c Sc 2 $35000 H#9 Us 1 Cent Blue-imperf-type4-franklin-used-n/g-fineU.s. #1402a, 1520b Mint Nh - 8c - 10c Imperf Pairs ($67)Sc # 611 Imperf Block Of 6 + On 1928 Spec Del'y Env Richmond Ind To New York NyUnited States #344 2c. Washington Imperf Strip Of 5 Mnh Xf771 16c Imperf Air Mail Special Delivery Farley Issue, First Day [e88921]771 16c Imperf Air Mail Special Delivery Farley Issue, First Day [e88920]Noblespirit No Reserve {4148/616} Us 1910-1919 Imperf & Coil Mnh-h Group =$196Noblespirit No Reserve {4148/613} Us 1912-18 Imperf, Perf, Coil Mnh Group =$200Scott#346, 4c Orange Brown Imperf Pair, Vf/xf.Usa Stamp #11 3c Washington Imperf . 1851-57 Used1933 - 1937. Perf & Imperf Mix (m & U) + A Few Miniature Sheets (60+ Stamps).1935 Imperf National Parks Complete Us Commemorative Stamp Set - MnhNoblespirit No Reserve Us National Parks Imperf Number Blocks Of 6 Mnh Set =$275Scott#1625a, 13c Flag Americana Coil Imperf Pair. Vf & Nh.Scott #531,532,533,534,534a,535 Imperfs F/vf Mnh Scv $241. ( Read Description)# 314 Imperf Line Strip/4 W/schermack Iii Perfs Mog Lot4856771 16c Imperf Air Mail Special Delivery Farley Issue, First Day [e88922]771 16c Imperf Air Mail Special Delivery Farley Issue, First Day [e88925]771 16c Imperf Air Mail Special Delivery Farley Issue, First Day [e88923]