Unicord Univerb For Sale. Rare vintage spring reverb. There's not much to say, except that when we were researching this one we found very little info on it. This means only one thing. It's worth a zillion dollars! HAHA! Umm, or about a zillion less than that. :D :o| This is a simple effect. In, tone control, reverb depth and out. Smack the side and you can be sure theres a spring inside, alright. Sounds... like a short spring reverb, with tone control!