Yeah, I would assume E.C. Brown was the guy who made that tool. It looks very much like a Crown marking gauge, so he probably modeled it after that and just built his own. Pretty common thing back then. Really cool tool, I'd cherish that. Props for putting it back into service.
So my workbench is actually all cleaned off. I spent about 2 hours last night cleaning up my work space (it's not a shop, so I won't call it that) and getting everything organized again so that I could actually do things. But for whatever reason, when I tried to do things, I just had zero desire to do it. I started to cut the fret slots on the Tele fretboard, but I just couldn't find any desire to do it. I got them all marked, but putting a saw to it just wasn't happening. I still need to build some sort of router sled jig thing for flattening those cutting boards that my planer sniped, but again, zero desire to start that too. In the end, I just gave up and went in the house and watched about 4 episodes of "Mysteries of the Abandoned".

I really need to figure out why I have zero drive.