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If you don't already have some, get yourself some neatsfoot oil (make sure it's 100% neatsfoot oil, you'll find it at tack or leather stores) and give those scales a bath. It's the best thing for...

+1 to both Zak and Carl said. Go slow, don't try to do too much and stop when it looks right to you. That patina has been hard won over the last couple hundred years, so don't throw it away lightly....