Well I am a gear junkie and love to B.S. about scuba related things. It really will be a blast to try this stuff out with the other divers.
I also found a few other items around my house from scuba-past. I found an old ikelite dive light that uses the old 6 volt dry cell. It actually still works! I used it on a dive earlier this year. Of course it is not nearly as old as the regulators I have.
My wife found a vintage dacor dive knife while on a dive together. It was found in fresh water, and looks like the day it was new! I have no idea on the age, but it is a massive RAMBO style knife and nothing I would want to have for diving.
I think that every one of us (us that are really into diving) have a collection of scuba stuff. It could be vintage gear, things found while diving, and even dive photos. What a great way to share our love for scuba with our diving and non-diving friends and family. Who knows, maybe something you have will spark someones intrest in this great sport.