The rig diagram on [this page](http://www.guitargeek.com/brian-robbo-robertson-thin-lizzy-guitar-rig-and-gear-setup-1974/) of Guitar Geek shows that Brian used a Colorsound Wah Wah.
Along with his love of Boss effects, Prince is a regular user of the Digitech Whammy, Dunlop Crybaby Wah (though he has been known to use a Colorsound Wah as well), and Line 6 MM4 modulation modeler.
In this photo of Bolan and his small pedalboard, the Colorsound Wah Wah pedal can be seen.
The Wha Wha is a colorsound Wha (vintage blue).
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