Without evidence / even with evidence the quickest route might be to buy it back. If it did turn up (and miracles do happen) I suspect you would jump at the chance anyway. With all you have said there is a chance it was sold as parts / melted for metal (sorry) as per post from
@JimInOz .
Another option might be to buy a similar watch and have the same engraving / add a few words and start another story to pass on. Wishing you luck.
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