But the big question, is the frame being sold on eBay (a M/L) the same frame (which looks more like a non corrected Medium) in the picture with Hemming??
Well to me it looks quite legit. Beside that I think the parts of Hemmings bike and also JMC in the back (jersey, FSR etc) do fit (just like the film date you posted), I think the story tuercas has told sounds quite right (move to Mexico, getting hold of the frame, loss of the cable holder on the transport, repairing it, having made Chris Igleheart a fork for it etc.), it just doesn´t sound like you have some random Yo sitting there where you plan to fool some folks. Btw. some of the pictures tuercas has posted in the other thread mentioned earlier are before the repaint and show the frame in the same original painting, just like it has been redone...
I think it´s a nice one to own