1858 SL Die Doubling?

One of my 1858 SL Flyers appears to have doubling on the second 'S' in States and on the 'OF'. I am attaching photos but they are not real clear (sorry I don't have a sophesticated camera set-up). Does anyone know what variety this is and is this fairly common?
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I only have a 6X magnifier so those pics are as big as I can make them to naturally. Photo software may be able to blow them up--I will try.
What are the characteristics of machine doubling vs. die doubling? Can one small area (like 3 or 4 letters) show machine doubling or would it usually extend to a larger area?