Recognize this tool?

6061T6

H-M Supporter - Silver Member
H-M Supporter - Silver Member
Joined
Oct 3, 2015
Messages
82
Dear machinist friends,
Do you recognize this tool? I got it as part of a major tool haul. Seems like some kind of boring head but it is a bit unusual. There is no maker’s mark.
 

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Sorry for the original bad photos.
Here you go
 

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Grinding jig would be my guess too, probably shop made.
 
I dont think it is shop made as seems to have nice markings - LOCK on one side and ABC on the other.
Unfortunately no makers mark.
 
You found it! I will try and research it.
 
Your google-fu is very good! Thanks.
I might have other attachments also in the pile. Mine appears unused. It originally came from a tool collector.
 
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