4spd. trans local to me listed for sale

Was wondering if anyone can tell me what it came out of, will list in missing item section also, wanted to try here first, thanks.

closest I can get - Lynch Rd. Detroit MI assembled '69 B-body: 9A241643

it's ~80 VINs after a known Road Runner & ~200 VINs before a known Super Bee

18 or 23 spline? Can’t tell from the picture

I can’t tell either but I’m thinking 23, I asked in just in case the serial # would pop as a 18 from a A12 or hemi car, there are enough guys on board who would probably know by the #’s if it was 18 or 23...I sent the guy a pm and am still waiting on a response anyway...

Looks like a 23 to me.