“The FZ-III is most likely from the early 70s, built in Italy and features a combination of two silicon BC239Cs and one BC238B. This is a very gnarly pedal and can be completely saturated, or crisp and tight. It has a very bright sound. This pedal works well with boost pedals first and an EQ can help to further shape the tone.”
Be aware that these do show up on eBay and are not as rare as one might think — bid accordingly.