“These Kay Fuzz effects are very popular and can command a high price. Perhaps this excerpt from Guitarplayer.com says it all: “The Kay looks so cheap it’s hard to take seriously, but this orange
plastic pedal produces wet, flatulent fuzz and does the Octavia thing
very nicely when the pedal is maxed. Very Hendrixy and cool for chords,
the Kay sounds like a combination of Octavia and Fuzz Face — a lot of
textures for virtually no controls.”
A modern, and vastly improved version can be found for sale here.