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7 points

It looks very rough, it could be an unfinished part: a fusion that hasn’t received the subsequent machining.
Maybe a flywheel.

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5 points

I think that’s just from many years of rust and wear. I doubt that’s the original surface finish

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1 point

Could be both

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What is this thing?

!whatisthisthing@lemmy.world

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Let us help you identify that mysterious object you’ve found.

Currently in CHALLENGE mode: If you’ve got something obscure knocking about, post a picture, and let’s see how we do. Please prefix such posts with “CHALLENGE:” so we know we’ve got a fighting chance.

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