It is my opinion this gun---any famous person's gun, is worth as much as you can get for it. As already noted you'll get more or less depending upon the makeup of the body of potential buyers. If it is your intent/desire to sell it, do yourself a favor, and secure the best possible agent to accomplish that objective for you. A PM to the author of post #7 will put you on the road to accomplishing that.

When it comes to an insurable value, you can insure it for whatever amount you wish. When it comes to collecting from the insuror in the event of loss, you will collect the amount/value you PROVE in your "proof of loss". Such proof can be established by the amounts paid for similar items in recent transactions. Given similar items are few and far between---and recent transactions are likewise few and far between (or unknown---and unknowable), you're left with appraisals by ACKNOWLEDGED EXPERTS for proof---and the more the merrier. That brings us back to the author of post #7---who can guide you to others.

On the one hand, while ownership of such treasures can be enormously satisfying, they can be a pain in the butt when the time comes to take them off the shelf---or collect for your loss when someone else takes it off your shelf. You either need to be prepared to accomplish these eventualities by yourself, or get some GOOD help.(!!)

Ralph Tremaine