Suspect Scott #391 Used Single.
According to The Experts Book this issue is often faked – especially pairs and guideline pairs and because there is no fully perforated stock from which to trim the perforations from the left and or right edges “if the perforations are determined to be genuine, then the item in question is also genuine. Fakes can be made adding perforations to the top and bottom and trimming the left and right of an imperforate #384 or adding perforations to the top and bottom of the imperforate coil #384V.
Since there is no fully perforated sheet stock from which to trim the left and right sides it stands to reason that if the perforations are found to be genuine then the suspect must be genuine.
A search of The Philatelic Foundation certificate database returned 380 examples and seven were deemed to be fake: one pair had a fake guide line drawn in, four were pairs with one having fake perforations, and two were singles.
The width of the suspect is 21.5mm which is the ideal width for a vertical coil but not a determining factor for being genuine.
The images below show the top and bottom perforations overlaid on genuine gauge 8 ˝ perforations.
As can be seen from the two images the perforations line up very well with the genuine ones. The bottom perforations show all of the signs of being genuine - slightly oval in shape, pulled paper fibers on the left side of the hole and there is a pressure ridge visible on the right side if the hole under low magnification and angled lighting. Unfortunately the pressure ridge did not photograph well.
Reference material used:
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