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 1847 Imperf 5c Dark Brown #1a Mint H Cat Val $8750Us 5c Regular, Imperf 1906-08 Sc 315 Nh Cat Value $1300Us 1851-57 Imperf 12c Black #17 Mint H Cat Val $6250Us 1847 Imperf Used 5c Sc 1 Cat $425Us 1847 Imperf 10c Black #2 Mint H Cat Val $35000Us 1906-08 Regular, Imperf Nh 5c Sc 315 Cat $600Us 5c Imperf 1847 Sc 1b Used Cat Value $750U.s. #17 Used Beauty - 12c Black, Imperf ($265)Us 12c Imperf 1851-57 Sc 17 H Cat Value $6250Noblespirit No Reserve {3970} Usa Imperf Miss Perf Booklet Panes X11 1949aUs Stamp:#r84a $2.50 Inland Exchange 1862-71 Revenue Stamp ImperfUs 1847 Imperf 5c Dark Brown #1a On Cover Cat Val $950U.s. #346 Mint Nh Pair - 4c Brown, Imperf ($62)Us 5c Imperf 1875 Sc 3 Ngai Cat Value $850U.s. #320 Mint Nh Pair - 2c Carmine, Imperf ($70)Us Stamp:#611 2c Black 1923 Harding Imperf Precancel Marion Ohio Blk Of 8 ClUs 1847 Imperf Used 10c Sc 2 Cat $1050Us Stamp:#384 2c Carmine 1910 Imperf Mnh/og Stamp Line PairUsa Imperf Pair (h18)Us Stamp:#r78a $1.50 Blue Inland Exchange 1862-71 Revenue Stamp Imperf PairUs 1847 Imperf Used 5c Sc 1a Cat $850Noblespirit No Reserve Us National Parks Imperf Number Blocks Of 6 Mnh Set =$275Sc# 2096b - Smokey The Bear -vert. Strip Of 3 Imperf Between W/selvage Imperf# 484 Imperf Paste Up Strip/4 W/schermack Iii Perfs Mog Lot4840United States #344 2c. Washington Imperf Strip Of 5 Mnh XfUs Stamp: #rb22a 3/8c Proprietary Revenue Imperf Mh/og Stamp Blk Of 4Noblespirit No Reserve {4148/612} Us 1916-19 Imperf, Perf, Coil Mnh Group =$315U.s. #2259a Mint Nh - 1988 13.2c Coal Car, Imperf Pair ($75)U.s. #1615e Mint Nh - 8.4c Piano, Imperf BetweenUnited States #484 3c. Washington Imperf Block Mnh XfUsa Stamp #11 3c Washington Imperf . 1851-57 Used1933 - 1937. Perf & Imperf Mix (m & U) + A Few Miniature Sheets (60+ Stamps).Us Stamp:#383 1c Green 1910 Imperf Mnh/og Stamp Line PairU.s. #345-47 Mint Nh - 3c - 5c Imperf, Dlw ($108)U.s. #1402a, 1520b Mint Nh - 8c - 10c Imperf Pairs ($67)U.s. #576-77 Mint Nh Plate Blocks - 1 1/2c - 2c Imperfs ($90)#9 Us 1 Cent Blue-imperf-type4-franklin-used-n/g-fineUs Revenue Stamps #r69a Imperf On Warranty Deed 1863U.s. #314, 320 Mint Vf Pairs - 1c - 2c Imperfs ($65)Buffalo Stamps, Scott #534 Washington Offset/imperf, Mint Nh/og & F/vf, Cv = $25Noblespirit 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 =$200Us Stamp:#408​ 1c Green 1912 Imperf Mnh/og Stamp Line Pair Xfs-superbSc# 2. 10c, Black. Imperf. Used. 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 Lot4856Noblespirit No Reserve {4148/621} Us No. 371 Imperf Pair Mnh X2 =$145 Cv3307 Duffy Duck *imperf Die Cut* 33c Mint Superb-nh SheetU.s. #899b-901a Mint Nh - 1940 Defense, Imperf Between Pairs ($92)U.s. #576//611 Mint Blocks - 1c - 2c Portraits, Imperf ($82)United States #482 2c. Washington Imperf Block Mnh XfU S Stamp Old Used 5c Jefferson Imperf #27 High Value Usa 1934 National Parks - Complete Set W/ Imperf Pairs On Cover Canx WashingtonUs Stamp: #r168a 10c 1898 Documentary Revenue Stamp Imperf Pair Mh/og StampUs Ndc 4846 Chinese Lunar New Year Imperf Imperforate No Die Cut Pair Mint MnhUs Stamp Sc# 343 1c-franklin 1908-09 Imperf. Issue Mint Og VfUs Stamps #314 & #320 Imperf Franklin WashingtonUs Fdc First Day Cover # 730 Century Of Progress 1933 Imperf By Beverly HillsOx7d - Error / Efo Vert. Pair Imperf Horiz. "officially Sealed" Mint Nh "read"Us Revenue Stamps #r60a Imperf On 11 Documents 1860s