Thank you Mr. Varenc and Mr. Code, Yes, that's what's left of what used to be my Amazon Klein bottle listing. Note that what used to be Klein Bottle by Cliff Stoll is now Amvoom Klein Bottle.
Although I created the listing 4 or 5 years ago, I'm now unable to edit or change the listing. I've bumped up my price sufficiently high, in hopes that nobody will buy from there.
(but you should actually buy from his website)