BBD based analog chorus/echo effect unit from the 80's. Makes typical tape-style delays used in reggae music, got huge self-oscillating feedback and quick delay time adjustment for creating special effects.
I was lucky and got it for a very little money. It is actually a very decent unit but it gets less attention because of the hype of tape-delays. It is or was called the poor man's space echo, but it is much more than that.