Somewhere between six and nine genuine examples of the 2¢ rotary stamp of 1912 are known with USAV III perforations. It is generally thought that these were perforated for collectors and not part of the normal USAV production.

This stamp was issued for the Mailometer Company but the gutters between the panes of stamps were 6mm wider than the gutters on the flat plate sheets, and these rotary sheets did not register properly in the Mailometer machines. Rather than retool their machines, all or nearly all of these sheets were returned. There are no genuine examples of this stamp with Schermack type III perforations known.

The Attleboro type I perforation runs across the entire margin separated by two narrow 1.1mm to 1.3mm strips. The central oblong/rectangular hole is 13mm wide by 1.5 to 1.8mm high with a V-shaped notch at top. Only three issues of U.S. stamps are known with this perforation, the double-line watermarked 1908 1¢ and 2¢ stamps, Scott 343 and 344, with horizontal perforations and the 1909 double-line watermarked 2¢ Alaska-Yukon commemorative, Scott 371, with vertical perforations.

The Brinkerhoff Company originally produced their coil stamps in Sedalia, Missouri, and received licenses to operate their machines in Missouri, Nebraska, Iowa, South Dakota, Colorado, Wyoming, Montana, Idaho, Utah, Nevada, Arizona and New Mexico. It is not certain in which cities Brinkerhoff had offices, but in 1909 an office in Denver was listed in the city directory. In 1910 the company moved from Sedalia to Lyons, Iowa. The company operated under a variety of names, including at least the following: the "Nebraska-Iowa Stamp Vending Company", "Brinkerhoff Stamp Vendor", "Postal Vending Manufacturing Co." and possibly the "Tri-State Stamp Vending Company".

The type I stamps have four 1.8mm in diameter holes uniformly spaced 3.2mm apart and no slits. All of the type II stamps have two larger 2.3mm diameter holes spaced 12.2mm apart and an overall length of 16.8mm. The type II have no slits, the type IIa have one long slit (about 9.7mm) between the holes and two shorter slits outside the holes, and the type IIb have two shorter slits (2.5-3mmm) between the holes and two short slits outside the holes. The holes on all of the Brinkerhoff stamps were applied to vertical strips of stamps prior to being placed in the vending machines. The slits were added in the vending process to aide the separation of stamps from the vending machine.

The John V. Farwell Company was a wholesale dry goods firm operating out of Chicago. In 1908 it began using the Schermack stamp-affixing machine to handle its heavy volume of mail. By 1911 it was decided that rather than paying the Mailometer Company a 50¢ per roll surcharge for their Schermack III coils, they might be able to produce their own coils to use in the Schermack machines at a cost saving. The large number of varieties in this group reflects the amount of experimentation that went into getting the stamps to feed properly in the Schermack machine. The nomenclature for these is as follows: The first number describes the number of holes at top and the last number the number of holes at bottom. The letter in the middle describes the spacing, where "A" describes a narrow spacing and "B" a wide spacing. All holes are 1.5mm in diameter, vertically aligned and spaced a more or less consistent .5mm apart.

The International Vending perforations are normal looking, continuous, round, generally well aligned 1mm in diameter holes with irregular spacing. They have a distinctive look with a variable tendency to slant from right to left as the result of having been made one row at a time using a single-stroke perforator. The proper gauge is approximately 12½ and examples that have gauge 13 perforations are not International Vending coils. According to Steven Belasco, there are no known genuine examples of the 1908-1909 imperforate issues, Scott 343-347.

The Schermack type I perforations may have six, seven or eight small holes, approximately 1mm in diameter and spaced .7mm apart. The early examples of these perforations have ragged holes while the later examples are much cleaner and more regularly spaced. The Schermack type II perforations have six holes 1.55 mm in diameter, larger than the type I holes, with uneven spacing. The Schermack type III perforation is the most common of all the vending and affixing machine perforations, having been used for twenty years. The oblong/rectangular hyphen holes are a distinctive 4.75mm high and 1.25mm wide with 3.25mm spacing. The size and spacing is quite uniform considering the length of production, although some of the early stamps have a slightly smaller spacing between the perforations. Every flat plate imperforate stamp illustrated above is known with Schermack type III perforations.