Jim,
I will say that every set of grade 2 and grade 3 Parker Damascus barrels that I have examined have been '3 iron crolle'. I have never seen '2 iron crolle' on a Parker hammerless but I have seen a distinct difference between early and late 3 iron crolle patterns. In my experience, I have not been able to discern any difference between the barrels of a grade 2 and the barrels of a grade 3 of the same manufacturing period.
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