The only factory stampings I'm able to find are on the lever.
Looks like ZAIAR Tool Co. Maybe?
I can't find anything on the company... Age unknown.
Regardless, looks to be in great use-able condition.
I'd like to fit her with a D1-6 Adjust-Tru/Set-Tru type backplate.
Currently I'm running a Hardinge-Shogren 5c with an integral D1-6. I've tweaked her so she is better by cleaning and fiddling with the cams and the tightening sequence. While very tolerable she has more run-out than I'd like.
It's most likely that I just haven't yet stumbled on the correct website, but I've not been able to locate either plans to fabricate an Adjust-Tru/Set-Tru type backplate or a company which sells one for retrofit.
Overall OD is 5.85 the ID on the nose is 1.75.
Any suggestions for a plan or a site for purchase?