“The rare ZVEX Fuzz Factory made with the revered “SPAM CAN”
transistors. These original Fuzz Factorys sound like no other and are
simply magical. Approximately 100 total Fuzz Factorys [like this] were ever made by
Zvex and the pedal pictured was one of the very last ones made. As indicated — Zack Vex personally signed this pedal (see photos in comments section).”
I have no idea if this information is true but it sounds good.