Okay, you guys are not going to believe this... My grandpa said something about his old diving certification in passing, which I had totally forgotten about, so I asked him about a weight belt. He said that he thinks he threw his old one away, but go rummage through the shed. So there I am, digging in old junk when lo-and-behold...
The real deal. Don't know what it's worth, but I know people have spent lots of time looking for them. Pretty cool, huh?