What kind of shanks are these?

I purchased these two facing and boring heads at auction the other day. I don't recognize the arbor/shank. They came from a machine shop that seemed to do things in XL sizes. For example, they were auctioning off an Aloris DA QCTP and tool holders. Anyway, the shank has an OD of 1.5".

Thank you.


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Well they ain't prison!



Sorry, could't help myself
 
Same thread question, different shank… What kind of shank is at bottom?? (R8 shown above for reference.) It’s a universal double taper “Z” collet holder for something, but I have know idea for what. If it’s listed in tools-n-gizmos link posted above, I didn’t see it.

EDIT: “drawbar thread” is ½-13
 

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Is it tapered in the middle? I thought it was at first, but maybe its just an illusion. Also, it's interesting that it has the three shinier rings around that middle section. I wonder why. Sorry that's not an answer. I'm just spit-balling at this point.
 
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