Got this one from a Cooper Owen auction 9-10 years ago.
Didn't come with any documenttion and I've contacted CO since, to try and get some provenance, but no response.
It's thick 47"x12" plexiglass with no colored gels on the back (I stuck some cardstock on the back to brighten it up a little) so I guess this panel was used for various different lighting scenarios, or perhaps moved between different sets. But it's definitely a 'Helm' style panel.
Comes complete with scratches