Paul, the distance and diameter of the circle differ depending on the period of Parker manufacture. Some were even patterned using an oval rather than a true circle. It would have been nice if the distance and the size of the circle were standardized from the very beginning, but that wouldn't attract nearly as much conversation. 
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"I'm a Setter man.
Not because I think they're better than the other breeds,
but because I'm a romantic - stuck on tradition - and to me, a Setter just "belongs" in the grouse picture."
George King, "That's Ruff", 2010 - a timeless classic.
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