woodworker88 wrote:
I think the plate is a special purpose faceplate someone made at
sometime for a particular project. Perhaps for use with toolmakers's
buttons.

Could be, but it looks factory, not shop-made. The numbers and the arrow
are machined, not stamped.

The toolholder isn't that surprising. I have seen a qc that
used movable gib-type objects in a regular t-slot type shape. Maybe
someone else has the qc toolholder that it fits to.

I need to find that someone and complete his set