I can understand that you would want to know that the gun is in good hands and being cared for as your grandfather would like.
I think you should be assured that it is and will be.
I would suggest that a public forum is not the ideal place to ask for , and expect, information on a particular rare shotgun.
Perhaps someone will get in touch with you if you were to make known how to be in touch privately.
Best,
John

Humble member of the League of Extraodinary Gentlemen (LEG). Joined 14 March, 2006. Member #1.