1. Could be a bit of grease on some areas on your coin, where the normal design is weak. (grease in the die, will prevent the strike of a dies designs)
2. Note the roof inside of the building, on the left side is showing weakness there also. But that area is were a clash could of happened in the past on this die and was polished off on that area, or it could be more of a grease issue?

So either part of a die event, or part of a striking event. Either way not a premium for this coin. Hub doubling on a coin will be raised an not incuse on a coin. The area on the left side of the roof is not raised, but reduced. So that is not hub doubling. (not an area that I've noticed for hub doubling)