It's a classic! The Uni-Vibe was meant to emulate a rotary speaker, which it kind of does, but it's also a kind of shimmery chorus and also dabs it foot in a few other streams too. Perfect for psych or shoegaze stuff. 

Model: Dunlop UV1 Uni-Vibe
Made: USA, recent model (serial AA41J944)
Type: phaser
Power: 18v negative supply
Switching: buffered bypass
Equivalent new street price (approx): n/a
Mods: none
Accessories: no box or manual
Condition notes: used, no major marks, very good condition