Up for sale is my minty Sequential Circuits Pro One. I honestly can't find a flaw on it. Sort of ridiculous since it was made in 1981. Very low serial number 0671! I can not 100% guarantee that there isn't something somewhere, but I have never written that  an old piece of equipment I have sold was in this condition. Look at my feedback and bid with confidence. Oh and it sounds amazing, doesn't have noise issues associated with old keyboards. 100% functional, J Wire version. I guarantee another one like this won't come around anytime soon. Here are a bunch of photos of the Pro One up for sale.