Rib Roll Mark
I have seen some three and four digit s/n guns with no rib roll mark. I have a nice gun from Jim Parker's collection, in the 1000 range with much later twist barrels properly fitted. When I studied the early No 2 order book I found "fit new barrels no charge" on almost every page. This might be a reason to put another factor above barrel steel as factor 1. That bow tie fore end pattern seems to have been pretty persistent over the first 3000 plus guns, and obviously trumps the two diamond pattern.
Best, Austin
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