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To each his own but I leave original scales as is if they are only chipped and the pivot is good. Even if the other end has a stable crack. I have a thing about original scales on old Sheffields....

If it doesn't have 'England' stamped on the tang, only Sheffield it is before 1881 IIRC when a treaty came into effect requiring country of origin stamps on cutlery. I would bet 1850s but I don't...