Very good question - I checked in with a real expert and got this unexpected answer: "Walcott? I consider these to be late impressions of the 492. I show two very distorted copies. This condition also exists on Gentry, AR 490. I show a block of twenty-five. It has double lines over subjects 1, 2, 6 and 7 and double lines at the bottom on subjects 19 and 20. The picture does not show all of the bottom row of stamps so subjects 21 to 25 could also have doubles at the bottom. I do not have any (that I remember) from any other state, but few of these devices lasted that long." quoted from Bill Cummings who is writing the authoritative book on precancel gooks. I have no idea how extra lines get put on a rubber device but it happened. Sometimes they are cut apart and reassembled. These are old devices - they were supposedly recalled and replaced in 1932!
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