I think Mr Wind is in fact correct: later versions of this model did have a valjoux movement.
https://heuerville.wordpress.com/2014/05/21/wittnauer-ref-7004a-chronograph/
Anyway, at the end of the day the value of a piece is what the market is willing to pay. If the watch finds a buyer at $2k, that is the market value. I am not willing to pay £4000 for a submariner, but many are, so that is the price of a submariner.
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