I looked up in Weller but didn't see any of what I'm showing. So I'm assuming this isn't a doubled die Q10²
Die Deterioration along with circulation wear. Comparing with listings at Wexler or Variety Vista is always a good thing to do when you suspect doubling.
I think, the mint mark usually will not be doubled, even when other real doubling is present. So if it is, it will usually be RPM or machine doubling.
