This benchmark is sitting in a local museum, dug up (according to the curator) about 5 years ago. They didn't even know what it was, but I snapped a quick picture with my phone. I've tried looking it up on the databases, but I can't find any marks with both the "UNION" designation and a matching year.
Does anyone have some suggestions? Worst case, I suppose I'll have to contact NGS directly.
http://sacina.com/unlinked/benchmark.jpg
Image linked because it's larger than I thought it'd be.
Thanks in advance.