I am looking for info on this vintage 1970's wah wah / fuzz pedal

I came across this pedal the other day (link below) and was curious if anybody know the history of this pedal or if they are worth anything. I plugged it in and it seems to work just fine no static or anything. And its got a pretty unique sound. Wah wah and fuzz pedal combined. And when i say fuzz good god... its got more fuzz than a 50 yr old biker!! It is adjustable though from none to good god. The wah wah side has a pretty wide range more than my cry baby wah. And you can use each effect seperatly or combined. Pretty wild pedal. Other than it sounding pretty cool i dont know anything else about it. Any of you know anything about it?

http://www.ebay.com/itm/Vintage-1971-Mica-wau-wau-wailer-pedal-wah-wah-fuzz-/290763443942?pt=Guitar_Accessories&hash=item43b2da0ee6

Thanks,