Dear Colin,
Because it doesn't fit in with your conspiracy theory?
He thought it was unusual and might have wanted to know what time it was, anyway.
He looked at his watch.
Big deal.
Get over it.
-- MWT 
It doesn’t agree with his own testimony under oath. He made up the watch comment for a book. Those are the facts. When you have something worthwhile to the discussion at hand please feel free to contribute.
PS how does it fit or not fit with my conspiracy theory?
I await in nervous anticipation for your answer.