This is a Bogner designed "Burnley" distortion style pedal with a Rupert designed transfomer. Purple top.
It works perfectly and requires a 9v power supply (not included). Has a Fat and Tight switch to change the distortion character. Check out YouTube videos by Brett Kingman and others.
There are a few small, very minor cosmetic dings - see photos. Mainly a little chip in the purple by the "rn" in Burnley front name for example. Still has original velcro attached on pedal bottom.
I bought this pedal at auction from the original owner Dweezil Zappa a few years ago when he sold a lot of studio gear to help fund his forthcoming tour.
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