In 12ga it made much more sense for the entry level buyer to purchase a 0 grade during the hammerless era unless the customer wanted a 10 ga Parker, then the only choice was a grade 1. That may be why many large frame 10's show up as N or grade 1's. From my perspective, in the modern day, I much prefer twist barrels over Vulcan steel but not the buyer of 100 years ago.
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