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[–] InnocentBystander 0 points 1 point (+1|-0) ago 

I would guess that they were cold forged with rocks.
I'm just speculating though.

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[–] Jasoman 0 points 3 points (+3|-0) ago 

you could still make a mold of a hammer with out any tools and use that to hammer on the metal when forging, but I have no idea what I am talking about.

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[–] arrggg 0 points 4 points (+4|-0) ago 

Bronze tools were cast, then sharpened with rocks.