What’s this?

yes...its a nice shape, missing the guard ring, I have one but not tried yet to see if it fits.

I have a couple of 501s in bits, one roughly my size which I am trying in vain to get the FAG BB out of before its repaint as its more rust than grey and one that was more complete but even more rusty & giant, the cranks on both those were Sakae CX. The smaller 501 has 531 forks which are original too it, so go figure that combo.

IMG_20230502_134850.jpg
 
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