Thanks for your reply.
It came in an old box with a C&M Hydraulics return label, but that's the only part with their name on it. I just figured the rebuilder's name would be on the pump somewhere, perhaps with a strong label attached to the reservoir.
There aren't many outfits and individuals that I trust when it comes to purchasing parts. I can't tell you how many used parts I've received in original manufacturer's boxes. They put the new part on the car and the old one in the box. Then, they wind up being sold as new some time later.