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:) I wish you had told him!

But if you want to get historical you can just cleave a flint rock and shave with it, preferably after getting soaked in the rain.

I believe the right place for some...

iirc you love patina :)
may be if sth. happens to it you can chop some onions and have the blade pick it up again :)
I think shaving with an old razor beats having it sit on the wall. old...