What is it? Indexing Face Plate?

[Raymond Seward]

Picked this up at an estate sale....my guess is that it is some kind of indexing FP am I correct? It is about 6" diameter and has a 1" 8 spindle thread. It would also seem there are parts missing? Any ideas? Thank you :-)

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[Dave Mcintire]

You didn,t show a view of the front, but my guess is that it might be part of an eccentric chuck.

[Bill Boehme]

Yep, it would be an indexing face plate. You would need something that attaches to the headstock to hold a locking pin.

[Raymond Seward]

Here is a picture of the front Dave

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[Marvin Hasenak]

It is an index plate, I have one just like it, it is or was sold by Penn State Industries. The current picture doesn't show it to be the same now. https://www.pennstateind.com/store/LIXU.html

[Raymond Seward]

Yup...think you are right Mrvin....I'm missing the bracket & pin assembly. Thanks for all the help :-)