You mention in your first post about a similar one in Sandringham. Does that have a similar provenance? That would be where I would start.
The value will be determined by what someone is prepared to pay over another. If it is truly desirable to a buyer and it is the only one then in some ways the price could potentially be what ever the seller wants as long as the buyer has pockets deep enough.......The most likely scenario is the person who buys this will be buying the history and not the rifle. As mentioned, the prominence of the General in the story will have an affect on the value. But I do understand why the name is not included in the details. I would suggest getting in touch with Museum curators, here and overseas. Particularly with people who deal with these history's. And then look into what rifles with similar provenance to history have sold for in the past.
@gundoc may have an idea on where to start asking and be able to point you in the right direction.
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