via Tone Tweakers on eBay, and Reverb
This item is unused, new old stock (!).
We googled this to see if we could find any reference to it and we couldn't, so we suspect they made very very few of them. Over 40 years later, we imagine most of them are long gone, and any surviving examples, if there are any, would be in poor condition.
As of writing this, we have 2 others available (search our website for jacket). We realize our asking price may seem quite high for a jacket, but, as mentioned, these jackets are pieces of vintage synth memorabilia and are the only ones of their kind we've ever seen in decades, and we've seen it all. Plus, there are some very serious collectors out there, and this is quite an interesting piece. If it doesn't sell soon, we may gradually lower the price, so if you're interested but don't want to pay our asking price, please let us know."