Thanks for your comments Guys.
This is a pretty old vise. Found a sticky spot on the jaws where a label was placed. It likely contained info about patents applied for and had peeled off. Several eBay photos of older Regal vise jaws displayed this label. My vise has jaws that are characteristically grooved and pointy like a Regal. That's how I finally convinced myself it was, indeed, a Regal.
It will travel to a class with me next weekend. I like it for traveling. It's one sturdy son-of-a-gun.
Do wish it had 360 degree rotation. Originally, I wanted to buy a spring material holder and the parts necessary to convert it to full rotation if possible. Tough to do when the manufacturer doesn't respond. As is, it has about 270 degrees worth and I seem to be OK with that.