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I find a lot of these fakes in the box lots I buy. These are Scott 319s that have been trimmed, poorly I might add, to look like Scott #320. The #320 is not a particularly rare stamp but it proves that you should only buy stamps from reputable dealers or in most cases you should buy imperforate stamps in pairs or blocks of four or more. With these stamps it may be a case of someone who did not like perforations - don't laugh, I've heard horror stories of people who trimmed off the perforations of 19^th century classics. The only other explanation I have heard is people trimming the perforations from an inexpensive stamp to resemble a more expensive imperforate variety in order to fill a space in their collection.

These three examples would fool no one only because of the obvious perforation pits left on the edges, but if a stamp with jumbo margins was carefully trimmed it might convince a collector who takes a quick look at it without examining the edges. 

Reference material used: How to Detect Damaged, Altered and Repaired Stamps. By Paul Schmid