Ace used this on the Rocket Ride guitar solo in 1977. This photo is of a pedal autographed by Ace, and more details were seen [here](http://www.acefrehleylespaul.com/AceWithoutALesPaul.html).
In this photo, where Harper's pedalboard is partially seen, the Vox V848 Clyde McCoy wah pedal is visible on the right, next to Boss tuner.
Very good, also just to look at it, Especially a vintage 60's made in italy model.
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