Neil Young Early Tonebender

Tru-Fi Pedals : Neil Young in older Buffalo Springfield picture with Tonebender ? Mark I or Mark II that is the mystery - Tru-Fi says it's a Mk II due to the time and also he was in the States. I do not believe it was a Mk II being that Neil was in the Calif, and I do not think many Tonebender Mk I got over here. BUT Neil Young was in the circle of musicians so it is possilble someone gave him one on tour at the Fillmore etc.  You have info please share ! Fuzz On -