Paul was seen playing through an Orange amp during the Free: Doing Their Thing filmed in 1970. Since this is the only occasion where he played it, it is very likely that the amp belonged to the studio where the band was playing and was possible there just for promotional purposes.
Based on the appearance and knob layout, this appears to be an OR100 model.
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Nah. Saw Free around 1970 at York University Central Hall.
They were definitely playing full Orange stacks. It’s burnt into my memory, just as his bright yellow loons are.