This alternator was in a box of parts that came with the 240z that I recently sold. It needs new bearings for sure but overall appears to be in good shape. Does anyone know if it a factory original or a parts store rebuild? Is there any market for original components like these for restorers?

Sorry, pretty sure the LR160 is the internally regulated model from 78 and onward. The early ones that need an external reg start with LT.. The very very early ones look rounded and puny. Now those are rare.

Thank you zKars. I did not even think about the ext. vs. int. regulation. I should have known! Oh well, what do I do with it? I hate to throw it out but no one will give me any core value for it unless I buy a new one.

It looks like original, with the IC Regulator sticker on it. I would have it tested and keep it or sell it. My original, old, worn alternators have all worked better (until they died) at idle speed, than my parts store alternator which suffered brown-out at idle in comparison