World War II German Flag/Banner from Eagles Nest

This banner was a trophy that my grandfather brought back from his service in World War II. He was an infantry gunner (tank gunner) in the 3rd Army, 14th Armored division. Following the Allied forces capture of Eagle's Nest, he acquired the banner shown in the attached pictures and was able to bring it home to the states. Until a year ago, this banner had been tucked away in a box, vacuum sealed, for decades. I recently had it framed within the shown shadowbox in order to protect and to display item rather than have it tucked away. I desire an appraisal of the item for insurance coverage purposes as due to sentimental reasons I would never part with it. I am reaching out to this group to get an initial feel for what I should expect this item to be worth as I feel it will be a large amount before I go the official route and get a documented appraisal that I can submit to my insurance company.