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From a book signing 1986:
I did find one TTM in my collection that I forgot about because I just though it was secretarial. I wrote to Walter first, then sent to Jack. Interestingly when Jack's came back there was note apologizing for the delay, saying Jack was away filming and signed it when he got back home. I think it was from his wife, but I have since lost the note, so cant say for sure. Anyway, I figured both signatures were not real from what I have heard about their TTMs, This was about 1994-5.