Hello, these items recently came up at a local auction. Mr. Mause passed away in 2005 and seems the family decided to liquidate the entire estate. His B-17 was "Boom Town" according the the American Air Museum in Britain. It was shot down after a bombing raid on a synthetic rubber plant in Huls Germany. He was then taken to Stalag Luft 3 (most famous for the great escape) where he was a POW (#1630) until the end of war. I was fortunate enough to get his POW ID tag with prayer book where he kept some notes including those on his B-17 that were not fortunate enough to survive the plane crash and his named Purple Heart. I believe the hat pictured is likely the hat he wore as a POW in Luft 3. Unfortunately the auction house did a poor job of keeping a lot of stuff together and many of his photos and diaries were split up into several groups that sadly went for over $200 a lot. If anyone has any more resources to research Mr. Mause I would be happy to look into more info.