Thanks to Joe-in-Mesa for spotting, then buying/mailing me this great find out of an antique shop. He snagged it for $35. I’m happy with that price. It needs one of the windshield support arms fixed and some repainting, but otherwise it is in good shape.
After doing some research on eBay, I’ve discovered this one is a little different than the ones listed there or on the CJ-3B page. Those all seem to have a central hole in the back that’s used for pulling a trailer (see examples at the bottom of the post). Instead of a hole, this one has two slots (I found one other with two slots).