"Your vacro example has alot in common with Galens C,A, example with the oxblood and all. Interesting!"
If you look carefully and compare the vacor look alike with Galen's c.a. swirl you'll see obvious differences in the glass between the vacor I found in the vat and his c.a swirl. :-)
There are differences in the composition of the colors of the glass used by each company, their construction attributes, and the resulting textural surface features..imho.
I think if one were to actually call the brownish red color oxblood on the vacor example, (which I would not), it was purely incidental and not by design. His c.a. swirl looks brown but does not look like the faux oxblood on the vacor example.
BT