70's Electro Harmonix Crying Tone Pedal Wha, EX - code Ef220 -
Great vintage wah - contrary to the name it's not a fuzz-wah, just a wah. Although it can be switched to a volume pedal, it has reverse sweep switching, and 5 frequency settings.
The controls are: MODE (selects between wah and volume pedal), TONE RANGE (selects from 4 different wah sweeps) and REVERSE (changes the direction of the sweep from low-high to high-low)
It's a great-sounding wah - really thick and chunky, with good percussive attack