Hi, I got this old United States stamp from 1912, which is normally perf 10 or 12. I measured it at at 11,75 horizontal. Is this any rarity or a normal deviation? I know perfs are normal to deviate a little from catalogues, but for these stamps there is a suggestion there was a period where they worked with a defect perforation wheel switch (sorry for using wrong words here, I am not an expert). I wonder whether this 11,75 may originate from that? I can make a higher resolution picture if this turns our crucial.