eBay item #7348019445 is a Univox, a fantastically cool valve-powered portable synth/organ, designed in 1946 by Tom Jennings, who went on to start the Vox company. This article explains it all: a 6 watt valve amp, various organ-style sound tabs (it's monophonic) and a vibrato effect. Best of all, the whole thing folds up into a crocodile skin suitcase. Think of it as a rock'n'roll Synthi. This one claims to 'almost' work, but has had no bids yet at £85.