This was purchased from a long-standing Machine Tool
Rebuilding shop and appears to be one of their shop-made tools. This
was a renown local place and had a HUGE amount of high quality precision
tools, reference surfaces, test bars etc.. Check my other listings for
some very interesting and obscure straight edges and test arbors.
As far as pricing goes, that information seems to be very obscure for
high-end equipment like this. I searched out some high-quality
manufacturers of similar equipment and have priced my items at 40-50% of
those amounts.