Old resale or antique stores sometimes carry misc hardware fasteners for people just like you who might be looking, they'd probably be all nice and tarnished for ya too!
I say this because an old friend of mine owns a shop like I described and sometimes when I'm in there I'll hold something bizarre or what otherwise looks like junk up and ask...? He'll just look at me and say "you wouldn't believe the stuff people come in here looking for"
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